forked from batoulapps/adhan-js
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathAdhan.js
1205 lines (1024 loc) · 42 KB
/
Adhan.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
(function webpackUniversalModuleDefinition(root, factory) {
if(typeof exports === 'object' && typeof module === 'object')
module.exports = factory();
else if(typeof define === 'function' && define.amd)
define([], factory);
else if(typeof exports === 'object')
exports["adhan"] = factory();
else
root["adhan"] = factory();
})(this, function() {
return /******/ (function(modules) { // webpackBootstrap
/******/ // The module cache
/******/ var installedModules = {};
/******/
/******/ // The require function
/******/ function __webpack_require__(moduleId) {
/******/
/******/ // Check if module is in cache
/******/ if(installedModules[moduleId]) {
/******/ return installedModules[moduleId].exports;
/******/ }
/******/ // Create a new module (and put it into the cache)
/******/ var module = installedModules[moduleId] = {
/******/ i: moduleId,
/******/ l: false,
/******/ exports: {}
/******/ };
/******/
/******/ // Execute the module function
/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
/******/
/******/ // Flag the module as loaded
/******/ module.l = true;
/******/
/******/ // Return the exports of the module
/******/ return module.exports;
/******/ }
/******/
/******/
/******/ // expose the modules object (__webpack_modules__)
/******/ __webpack_require__.m = modules;
/******/
/******/ // expose the module cache
/******/ __webpack_require__.c = installedModules;
/******/
/******/ // define getter function for harmony exports
/******/ __webpack_require__.d = function(exports, name, getter) {
/******/ if(!__webpack_require__.o(exports, name)) {
/******/ Object.defineProperty(exports, name, { enumerable: true, get: getter });
/******/ }
/******/ };
/******/
/******/ // define __esModule on exports
/******/ __webpack_require__.r = function(exports) {
/******/ if(typeof Symbol !== 'undefined' && Symbol.toStringTag) {
/******/ Object.defineProperty(exports, Symbol.toStringTag, { value: 'Module' });
/******/ }
/******/ Object.defineProperty(exports, '__esModule', { value: true });
/******/ };
/******/
/******/ // create a fake namespace object
/******/ // mode & 1: value is a module id, require it
/******/ // mode & 2: merge all properties of value into the ns
/******/ // mode & 4: return value when already ns object
/******/ // mode & 8|1: behave like require
/******/ __webpack_require__.t = function(value, mode) {
/******/ if(mode & 1) value = __webpack_require__(value);
/******/ if(mode & 8) return value;
/******/ if((mode & 4) && typeof value === 'object' && value && value.__esModule) return value;
/******/ var ns = Object.create(null);
/******/ __webpack_require__.r(ns);
/******/ Object.defineProperty(ns, 'default', { enumerable: true, value: value });
/******/ if(mode & 2 && typeof value != 'string') for(var key in value) __webpack_require__.d(ns, key, function(key) { return value[key]; }.bind(null, key));
/******/ return ns;
/******/ };
/******/
/******/ // getDefaultExport function for compatibility with non-harmony modules
/******/ __webpack_require__.n = function(module) {
/******/ var getter = module && module.__esModule ?
/******/ function getDefault() { return module['default']; } :
/******/ function getModuleExports() { return module; };
/******/ __webpack_require__.d(getter, 'a', getter);
/******/ return getter;
/******/ };
/******/
/******/ // Object.prototype.hasOwnProperty.call
/******/ __webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };
/******/
/******/ // __webpack_public_path__
/******/ __webpack_require__.p = "";
/******/
/******/
/******/ // Load entry module and return exports
/******/ return __webpack_require__(__webpack_require__.s = 0);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */
/***/ (function(module, __webpack_exports__, __webpack_require__) {
"use strict";
// ESM COMPAT FLAG
__webpack_require__.r(__webpack_exports__);
// CONCATENATED MODULE: ./src/Coordinates.js
class Coordinates {
constructor(latitude, longitude) {
this.latitude = latitude;
this.longitude = longitude;
}
}
// CONCATENATED MODULE: ./src/MathUtils.js
function degreesToRadians(degrees) {
return degrees * Math.PI / 180.0;
}
function radiansToDegrees(radians) {
return radians * 180.0 / Math.PI;
}
function normalizeToScale(number, max) {
return number - max * Math.floor(number / max);
}
function unwindAngle(angle) {
return normalizeToScale(angle, 360.0);
}
function quadrantShiftAngle(angle) {
if (angle >= -180 && angle <= 180) {
return angle;
}
return angle - 360 * Math.round(angle / 360);
}
// CONCATENATED MODULE: ./src/Rounding.js
const Rounding = {
Nearest: 'nearest',
Up: 'up',
None: 'none'
};
// CONCATENATED MODULE: ./src/DateUtils.js
function dateByAddingDays(date, days) {
const year = date.getFullYear();
const month = date.getMonth();
const day = date.getDate() + days;
const hours = date.getHours();
const minutes = date.getMinutes();
const seconds = date.getSeconds();
return new Date(year, month, day, hours, minutes, seconds);
}
function dateByAddingMinutes(date, minutes) {
return dateByAddingSeconds(date, minutes * 60);
}
function dateByAddingSeconds(date, seconds) {
return new Date(date.getTime() + seconds * 1000);
}
function roundedMinute(date, rounding = Rounding.Nearest) {
const seconds = date.getUTCSeconds();
let offset = seconds >= 30 ? 60 - seconds : -1 * seconds;
if (rounding === Rounding.Up) {
offset = 60 - seconds;
} else if (rounding === Rounding.None) {
offset = 0;
}
return dateByAddingSeconds(date, offset);
}
function DateUtils_dayOfYear(date) {
let returnedDayOfYear = 0;
const feb = src_Astronomical.isLeapYear(date.getFullYear()) ? 29 : 28;
const months = [31, feb, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31];
for (let i = 0; i < date.getMonth(); i++) {
returnedDayOfYear += months[i];
}
returnedDayOfYear += date.getDate();
return returnedDayOfYear;
}
function isValidDate(date) {
return date instanceof Date && !isNaN(date.valueOf());
}
// CONCATENATED MODULE: ./src/Shafaq.js
// Shafaq is the twilight in the sky. Different madhabs define the appearance of
// twilight differently. These values are used by the MoonsightingComittee method
// for the different ways to calculate Isha.
const Shafaq = {
// General is a combination of Ahmer and Abyad.
General: 'general',
// Ahmer means the twilight is the red glow in the sky. Used by the Shafi, Maliki, and Hanbali madhabs.
Ahmer: 'ahmer',
// Abyad means the twilight is the white glow in the sky. Used by the Hanafi madhab.
Abyad: 'abyad'
};
// CONCATENATED MODULE: ./src/Astronomical.js
/* eslint-disable max-params, max-lines */
const Astronomical = {
/* The geometric mean longitude of the sun in degrees. */
meanSolarLongitude(julianCentury) {
const T = julianCentury;
/* Equation from Astronomical Algorithms page 163 */
const term1 = 280.4664567;
const term2 = 36000.76983 * T;
const term3 = 0.0003032 * Math.pow(T, 2);
const L0 = term1 + term2 + term3;
return unwindAngle(L0);
},
/* The geometric mean longitude of the moon in degrees. */
meanLunarLongitude(julianCentury) {
const T = julianCentury;
/* Equation from Astronomical Algorithms page 144 */
const term1 = 218.3165;
const term2 = 481267.8813 * T;
const Lp = term1 + term2;
return unwindAngle(Lp);
},
ascendingLunarNodeLongitude(julianCentury) {
const T = julianCentury;
/* Equation from Astronomical Algorithms page 144 */
const term1 = 125.04452;
const term2 = 1934.136261 * T;
const term3 = 0.0020708 * Math.pow(T, 2);
const term4 = Math.pow(T, 3) / 450000;
const Omega = term1 - term2 + term3 + term4;
return unwindAngle(Omega);
},
/* The mean anomaly of the sun. */
meanSolarAnomaly(julianCentury) {
const T = julianCentury;
/* Equation from Astronomical Algorithms page 163 */
const term1 = 357.52911;
const term2 = 35999.05029 * T;
const term3 = 0.0001537 * Math.pow(T, 2);
const M = term1 + term2 - term3;
return unwindAngle(M);
},
/* The Sun's equation of the center in degrees. */
solarEquationOfTheCenter(julianCentury, meanAnomaly) {
const T = julianCentury;
/* Equation from Astronomical Algorithms page 164 */
const Mrad = degreesToRadians(meanAnomaly);
const term1 = (1.914602 - 0.004817 * T - 0.000014 * Math.pow(T, 2)) * Math.sin(Mrad);
const term2 = (0.019993 - 0.000101 * T) * Math.sin(2 * Mrad);
const term3 = 0.000289 * Math.sin(3 * Mrad);
return term1 + term2 + term3;
},
/* The apparent longitude of the Sun, referred to the
true equinox of the date. */
apparentSolarLongitude(julianCentury, meanLongitude) {
const T = julianCentury;
const L0 = meanLongitude;
/* Equation from Astronomical Algorithms page 164 */
const longitude = L0 + Astronomical.solarEquationOfTheCenter(T, Astronomical.meanSolarAnomaly(T));
const Omega = 125.04 - 1934.136 * T;
const Lambda = longitude - 0.00569 - 0.00478 * Math.sin(degreesToRadians(Omega));
return unwindAngle(Lambda);
},
/* The mean obliquity of the ecliptic, formula
adopted by the International Astronomical Union.
Represented in degrees. */
meanObliquityOfTheEcliptic(julianCentury) {
const T = julianCentury;
/* Equation from Astronomical Algorithms page 147 */
const term1 = 23.439291;
const term2 = 0.013004167 * T;
const term3 = 0.0000001639 * Math.pow(T, 2);
const term4 = 0.0000005036 * Math.pow(T, 3);
return term1 - term2 - term3 + term4;
},
/* The mean obliquity of the ecliptic, corrected for
calculating the apparent position of the sun, in degrees. */
apparentObliquityOfTheEcliptic(julianCentury, meanObliquityOfTheEcliptic) {
const T = julianCentury;
const Epsilon0 = meanObliquityOfTheEcliptic;
/* Equation from Astronomical Algorithms page 165 */
const O = 125.04 - 1934.136 * T;
return Epsilon0 + 0.00256 * Math.cos(degreesToRadians(O));
},
/* Mean sidereal time, the hour angle of the vernal equinox, in degrees. */
meanSiderealTime(julianCentury) {
const T = julianCentury;
/* Equation from Astronomical Algorithms page 165 */
const JD = T * 36525 + 2451545.0;
const term1 = 280.46061837;
const term2 = 360.98564736629 * (JD - 2451545);
const term3 = 0.000387933 * Math.pow(T, 2);
const term4 = Math.pow(T, 3) / 38710000;
const Theta = term1 + term2 + term3 - term4;
return unwindAngle(Theta);
},
nutationInLongitude(julianCentury, solarLongitude, lunarLongitude, ascendingNode) {
const L0 = solarLongitude;
const Lp = lunarLongitude;
const Omega = ascendingNode;
/* Equation from Astronomical Algorithms page 144 */
const term1 = -17.2 / 3600 * Math.sin(degreesToRadians(Omega));
const term2 = 1.32 / 3600 * Math.sin(2 * degreesToRadians(L0));
const term3 = 0.23 / 3600 * Math.sin(2 * degreesToRadians(Lp));
const term4 = 0.21 / 3600 * Math.sin(2 * degreesToRadians(Omega));
return term1 - term2 - term3 + term4;
},
nutationInObliquity(julianCentury, solarLongitude, lunarLongitude, ascendingNode) {
const L0 = solarLongitude;
const Lp = lunarLongitude;
const Omega = ascendingNode;
/* Equation from Astronomical Algorithms page 144 */
const term1 = 9.2 / 3600 * Math.cos(degreesToRadians(Omega));
const term2 = 0.57 / 3600 * Math.cos(2 * degreesToRadians(L0));
const term3 = 0.10 / 3600 * Math.cos(2 * degreesToRadians(Lp));
const term4 = 0.09 / 3600 * Math.cos(2 * degreesToRadians(Omega));
return term1 + term2 + term3 - term4;
},
altitudeOfCelestialBody(observerLatitude, declination, localHourAngle) {
const Phi = observerLatitude;
const delta = declination;
const H = localHourAngle;
/* Equation from Astronomical Algorithms page 93 */
const term1 = Math.sin(degreesToRadians(Phi)) * Math.sin(degreesToRadians(delta));
const term2 = Math.cos(degreesToRadians(Phi)) * Math.cos(degreesToRadians(delta)) * Math.cos(degreesToRadians(H));
return radiansToDegrees(Math.asin(term1 + term2));
},
approximateTransit(longitude, siderealTime, rightAscension) {
const L = longitude;
const Theta0 = siderealTime;
const a2 = rightAscension;
/* Equation from page Astronomical Algorithms 102 */
const Lw = L * -1;
return normalizeToScale((a2 + Lw - Theta0) / 360, 1);
},
/* The time at which the sun is at its highest point in the sky (in universal time) */
correctedTransit(approximateTransit, longitude, siderealTime, rightAscension, previousRightAscension, nextRightAscension) {
const m0 = approximateTransit;
const L = longitude;
const Theta0 = siderealTime;
const a2 = rightAscension;
const a1 = previousRightAscension;
const a3 = nextRightAscension;
/* Equation from page Astronomical Algorithms 102 */
const Lw = L * -1;
const Theta = unwindAngle(Theta0 + 360.985647 * m0);
const a = unwindAngle(Astronomical.interpolateAngles(a2, a1, a3, m0));
const H = quadrantShiftAngle(Theta - Lw - a);
const dm = H / -360;
return (m0 + dm) * 24;
},
correctedHourAngle(approximateTransit, angle, coordinates, afterTransit, siderealTime, rightAscension, previousRightAscension, nextRightAscension, declination, previousDeclination, nextDeclination) {
const m0 = approximateTransit;
const h0 = angle;
const Theta0 = siderealTime;
const a2 = rightAscension;
const a1 = previousRightAscension;
const a3 = nextRightAscension;
const d2 = declination;
const d1 = previousDeclination;
const d3 = nextDeclination;
/* Equation from page Astronomical Algorithms 102 */
const Lw = coordinates.longitude * -1;
const term1 = Math.sin(degreesToRadians(h0)) - Math.sin(degreesToRadians(coordinates.latitude)) * Math.sin(degreesToRadians(d2));
const term2 = Math.cos(degreesToRadians(coordinates.latitude)) * Math.cos(degreesToRadians(d2));
const H0 = radiansToDegrees(Math.acos(term1 / term2));
const m = afterTransit ? m0 + H0 / 360 : m0 - H0 / 360;
const Theta = unwindAngle(Theta0 + 360.985647 * m);
const a = unwindAngle(Astronomical.interpolateAngles(a2, a1, a3, m));
const delta = Astronomical.interpolate(d2, d1, d3, m);
const H = Theta - Lw - a;
const h = Astronomical.altitudeOfCelestialBody(coordinates.latitude, delta, H);
const term3 = h - h0;
const term4 = 360 * Math.cos(degreesToRadians(delta)) * Math.cos(degreesToRadians(coordinates.latitude)) * Math.sin(degreesToRadians(H));
const dm = term3 / term4;
return (m + dm) * 24;
},
/* Interpolation of a value given equidistant
previous and next values and a factor
equal to the fraction of the interpolated
point's time over the time between values. */
interpolate(y2, y1, y3, n) {
/* Equation from Astronomical Algorithms page 24 */
const a = y2 - y1;
const b = y3 - y2;
const c = b - a;
return y2 + n / 2 * (a + b + n * c);
},
/* Interpolation of three angles, accounting for
angle unwinding. */
interpolateAngles(y2, y1, y3, n) {
/* Equation from Astronomical Algorithms page 24 */
const a = unwindAngle(y2 - y1);
const b = unwindAngle(y3 - y2);
const c = b - a;
return y2 + n / 2 * (a + b + n * c);
},
/* The Julian Day for the given Gregorian date components. */
julianDay(year, month, day, hours) {
/* Equation from Astronomical Algorithms page 60 */
if (typeof hours === 'undefined') {
hours = 0;
}
const trunc = Math.trunc || function (x) {
return x < 0 ? Math.ceil(x) : Math.floor(x);
};
const Y = trunc(month > 2 ? year : year - 1);
const M = trunc(month > 2 ? month : month + 12);
const D = day + hours / 24;
const A = trunc(Y / 100);
const B = trunc(2 - A + trunc(A / 4));
const i0 = trunc(365.25 * (Y + 4716));
const i1 = trunc(30.6001 * (M + 1));
return i0 + i1 + D + B - 1524.5;
},
/* Julian century from the epoch. */
julianCentury(julianDay) {
/* Equation from Astronomical Algorithms page 163 */
return (julianDay - 2451545.0) / 36525;
},
/* Whether or not a year is a leap year (has 366 days). */
isLeapYear(year) {
if (year % 4 !== 0) {
return false;
}
if (year % 100 === 0 && year % 400 !== 0) {
return false;
}
return true;
},
seasonAdjustedMorningTwilight(latitude, dayOfYear, year, sunrise) {
const a = 75 + 28.65 / 55.0 * Math.abs(latitude);
const b = 75 + 19.44 / 55.0 * Math.abs(latitude);
const c = 75 + 32.74 / 55.0 * Math.abs(latitude);
const d = 75 + 48.10 / 55.0 * Math.abs(latitude);
const adjustment = function () {
const dyy = Astronomical.daysSinceSolstice(dayOfYear, year, latitude);
if (dyy < 91) {
return a + (b - a) / 91.0 * dyy;
} else if (dyy < 137) {
return b + (c - b) / 46.0 * (dyy - 91);
} else if (dyy < 183) {
return c + (d - c) / 46.0 * (dyy - 137);
} else if (dyy < 229) {
return d + (c - d) / 46.0 * (dyy - 183);
} else if (dyy < 275) {
return c + (b - c) / 46.0 * (dyy - 229);
} else {
return b + (a - b) / 91.0 * (dyy - 275);
}
}();
return dateByAddingSeconds(sunrise, Math.round(adjustment * -60.0));
},
seasonAdjustedEveningTwilight(latitude, dayOfYear, year, sunset, shafaq) {
let a, b, c, d;
if (shafaq === Shafaq.Ahmer) {
a = 62 + 17.40 / 55.0 * Math.abs(latitude);
b = 62 - 7.160 / 55.0 * Math.abs(latitude);
c = 62 + 5.120 / 55.0 * Math.abs(latitude);
d = 62 + 19.44 / 55.0 * Math.abs(latitude);
} else if (shafaq === Shafaq.Abyad) {
a = 75 + 25.60 / 55.0 * Math.abs(latitude);
b = 75 + 7.160 / 55.0 * Math.abs(latitude);
c = 75 + 36.84 / 55.0 * Math.abs(latitude);
d = 75 + 81.84 / 55.0 * Math.abs(latitude);
} else {
a = 75 + 25.60 / 55.0 * Math.abs(latitude);
b = 75 + 2.050 / 55.0 * Math.abs(latitude);
c = 75 - 9.210 / 55.0 * Math.abs(latitude);
d = 75 + 6.140 / 55.0 * Math.abs(latitude);
}
const adjustment = function () {
const dyy = Astronomical.daysSinceSolstice(dayOfYear, year, latitude);
if (dyy < 91) {
return a + (b - a) / 91.0 * dyy;
} else if (dyy < 137) {
return b + (c - b) / 46.0 * (dyy - 91);
} else if (dyy < 183) {
return c + (d - c) / 46.0 * (dyy - 137);
} else if (dyy < 229) {
return d + (c - d) / 46.0 * (dyy - 183);
} else if (dyy < 275) {
return c + (b - c) / 46.0 * (dyy - 229);
} else {
return b + (a - b) / 91.0 * (dyy - 275);
}
}();
return dateByAddingSeconds(sunset, Math.round(adjustment * 60.0));
},
daysSinceSolstice(dayOfYear, year, latitude) {
let daysSinceSolstice = 0;
const northernOffset = 10;
const southernOffset = Astronomical.isLeapYear(year) ? 173 : 172;
const daysInYear = Astronomical.isLeapYear(year) ? 366 : 365;
if (latitude >= 0) {
daysSinceSolstice = dayOfYear + northernOffset;
if (daysSinceSolstice >= daysInYear) {
daysSinceSolstice = daysSinceSolstice - daysInYear;
}
} else {
daysSinceSolstice = dayOfYear - southernOffset;
if (daysSinceSolstice < 0) {
daysSinceSolstice = daysSinceSolstice + daysInYear;
}
}
return daysSinceSolstice;
}
};
/* harmony default export */ var src_Astronomical = (Astronomical);
// CONCATENATED MODULE: ./src/SolarCoordinates.js
class SolarCoordinates_SolarCoordinates {
constructor(julianDay) {
const T = src_Astronomical.julianCentury(julianDay);
const L0 = src_Astronomical.meanSolarLongitude(T);
const Lp = src_Astronomical.meanLunarLongitude(T);
const Omega = src_Astronomical.ascendingLunarNodeLongitude(T);
const Lambda = degreesToRadians(src_Astronomical.apparentSolarLongitude(T, L0));
const Theta0 = src_Astronomical.meanSiderealTime(T);
const dPsi = src_Astronomical.nutationInLongitude(T, L0, Lp, Omega);
const dEpsilon = src_Astronomical.nutationInObliquity(T, L0, Lp, Omega);
const Epsilon0 = src_Astronomical.meanObliquityOfTheEcliptic(T);
const EpsilonApparent = degreesToRadians(src_Astronomical.apparentObliquityOfTheEcliptic(T, Epsilon0));
/* declination: The declination of the sun, the angle between
the rays of the Sun and the plane of the Earth's
equator, in degrees.
Equation from Astronomical Algorithms page 165 */
this.declination = radiansToDegrees(Math.asin(Math.sin(EpsilonApparent) * Math.sin(Lambda)));
/* rightAscension: Right ascension of the Sun, the angular distance on the
celestial equator from the vernal equinox to the hour circle,
in degrees.
Equation from Astronomical Algorithms page 165 */
this.rightAscension = unwindAngle(radiansToDegrees(Math.atan2(Math.cos(EpsilonApparent) * Math.sin(Lambda), Math.cos(Lambda))));
/* apparentSiderealTime: Apparent sidereal time, the hour angle of the vernal
equinox, in degrees.
Equation from Astronomical Algorithms page 88 */
this.apparentSiderealTime = Theta0 + dPsi * 3600 * Math.cos(degreesToRadians(Epsilon0 + dEpsilon)) / 3600;
}
}
// CONCATENATED MODULE: ./src/SolarTime.js
class SolarTime_SolarTime {
constructor(date, coordinates) {
const julianDay = src_Astronomical.julianDay(date.getFullYear(), date.getMonth() + 1, date.getDate(), 0);
this.observer = coordinates;
this.solar = new SolarCoordinates_SolarCoordinates(julianDay);
this.prevSolar = new SolarCoordinates_SolarCoordinates(julianDay - 1);
this.nextSolar = new SolarCoordinates_SolarCoordinates(julianDay + 1);
const m0 = src_Astronomical.approximateTransit(coordinates.longitude, this.solar.apparentSiderealTime, this.solar.rightAscension);
const solarAltitude = -50.0 / 60.0;
this.approxTransit = m0;
this.transit = src_Astronomical.correctedTransit(m0, coordinates.longitude, this.solar.apparentSiderealTime, this.solar.rightAscension, this.prevSolar.rightAscension, this.nextSolar.rightAscension);
this.sunrise = src_Astronomical.correctedHourAngle(m0, solarAltitude, coordinates, false, this.solar.apparentSiderealTime, this.solar.rightAscension, this.prevSolar.rightAscension, this.nextSolar.rightAscension, this.solar.declination, this.prevSolar.declination, this.nextSolar.declination);
this.sunset = src_Astronomical.correctedHourAngle(m0, solarAltitude, coordinates, true, this.solar.apparentSiderealTime, this.solar.rightAscension, this.prevSolar.rightAscension, this.nextSolar.rightAscension, this.solar.declination, this.prevSolar.declination, this.nextSolar.declination);
}
hourAngle(angle, afterTransit) {
return src_Astronomical.correctedHourAngle(this.approxTransit, angle, this.observer, afterTransit, this.solar.apparentSiderealTime, this.solar.rightAscension, this.prevSolar.rightAscension, this.nextSolar.rightAscension, this.solar.declination, this.prevSolar.declination, this.nextSolar.declination);
}
afternoon(shadowLength) {
// TODO source shadow angle calculation
const tangent = Math.abs(this.observer.latitude - this.solar.declination);
const inverse = shadowLength + Math.tan(degreesToRadians(tangent));
const angle = radiansToDegrees(Math.atan(1.0 / inverse));
return this.hourAngle(angle, true);
}
}
// CONCATENATED MODULE: ./src/TimeComponents.js
class TimeComponents {
constructor(number) {
this.hours = Math.floor(number);
this.minutes = Math.floor((number - this.hours) * 60);
this.seconds = Math.floor((number - (this.hours + this.minutes / 60)) * 60 * 60);
return this;
}
utcDate(year, month, date) {
return new Date(Date.UTC(year, month, date, this.hours, this.minutes, this.seconds));
}
}
// CONCATENATED MODULE: ./src/Prayer.js
const Prayer = {
Fajr: 'fajr',
Sunrise: 'sunrise',
Dhuhr: 'dhuhr',
Asr: 'asr',
Maghrib: 'maghrib',
Isha: 'isha',
None: 'none'
};
/* harmony default export */ var src_Prayer = (Prayer);
// CONCATENATED MODULE: ./src/Madhab.js
const Madhab = {
Shafi: 'shafi',
Hanafi: 'hanafi'
};
function Madhab_shadowLength(madhab) {
switch (madhab) {
case Madhab.Shafi:
return 1;
case Madhab.Hanafi:
return 2;
default:
throw "Invalid Madhab";
}
}
// CONCATENATED MODULE: ./src/PolarCircleResolution.js
const PolarCircleResolution = {
AqrabBalad: 'AqrabBalad',
AqrabYaum: 'AqrabYaum',
Unresolved: 'Unresolved'
};
const LATITUDE_VARIATION_STEP = 0.5; // Degrees to add/remove at each resolution step
const UNSAFE_LATITUDE = 65; // Based on https://en.wikipedia.org/wiki/Midnight_sun
const isValidSolarTime = solarTime => solarTime && !isNaN(solarTime.sunrise) && !isNaN(solarTime.sunset);
const aqrabYaumResolver = (coordinates, date, daysAdded = 1, direction = 1) => {
if (daysAdded > Math.ceil(365 / 2)) {
return null;
}
const testDate = new Date(date.getTime());
testDate.setDate(testDate.getDate() + direction * daysAdded);
const tomorrow = dateByAddingDays(testDate, 1);
const solarTime = new SolarTime_SolarTime(testDate, coordinates);
const tomorrowSolarTime = new SolarTime_SolarTime(tomorrow, coordinates);
if (!isValidSolarTime(solarTime) || !isValidSolarTime(tomorrowSolarTime)) {
return aqrabYaumResolver(coordinates, date, daysAdded + (direction > 0 ? 0 : 1), -direction);
}
return {
date,
tomorrow,
coordinates,
solarTime,
tomorrowSolarTime
};
};
const aqrabBaladResolver = (coordinates, date, latitude) => {
const solarTime = new SolarTime_SolarTime(date, { ...coordinates,
latitude
});
const tomorrow = dateByAddingDays(date, 1);
const tomorrowSolarTime = new SolarTime_SolarTime(tomorrow, { ...coordinates,
latitude
});
if (!isValidSolarTime(solarTime) || !isValidSolarTime(tomorrowSolarTime)) {
return Math.abs(latitude) >= UNSAFE_LATITUDE ? aqrabBaladResolver(coordinates, date, latitude - Math.sign(latitude) * LATITUDE_VARIATION_STEP) : null;
}
return {
date,
tomorrow,
coordinates: {
latitude,
longitude: coordinates.longitude
},
solarTime,
tomorrowSolarTime
};
};
const polarCircleResolvedValues = (resolver, date, coordinates) => {
const defaultReturn = {
date,
tomorrow: dateByAddingDays(date, 1),
coordinates,
solarTime: new SolarTime_SolarTime(date, coordinates),
tomorrowSolarTime: new SolarTime_SolarTime(dateByAddingDays(date, 1), coordinates)
};
switch (resolver) {
case PolarCircleResolution.AqrabYaum:
{
return aqrabYaumResolver(coordinates, date) || defaultReturn;
}
case PolarCircleResolution.AqrabBalad:
{
const {
latitude
} = coordinates;
return aqrabBaladResolver(coordinates, date, latitude - Math.sign(latitude) * LATITUDE_VARIATION_STEP) || defaultReturn;
}
default:
{
return defaultReturn;
}
}
};
// CONCATENATED MODULE: ./src/PrayerTimes.js
class PrayerTimes_PrayerTimes {
// eslint-disable-next-line complexity
constructor(coordinates, date, calculationParameters) {
this.coordinates = coordinates;
this.date = date;
this.calculationParameters = calculationParameters;
let solarTime = new SolarTime_SolarTime(date, coordinates);
let fajrTime;
let sunriseTime;
let dhuhrTime;
let asrTime;
let maghribTime;
let ishaTime;
let nightFraction;
dhuhrTime = new TimeComponents(solarTime.transit).utcDate(date.getFullYear(), date.getMonth(), date.getDate());
sunriseTime = new TimeComponents(solarTime.sunrise).utcDate(date.getFullYear(), date.getMonth(), date.getDate());
let sunsetTime = new TimeComponents(solarTime.sunset).utcDate(date.getFullYear(), date.getMonth(), date.getDate());
const tomorrow = dateByAddingDays(date, 1);
let tomorrowSolarTime = new SolarTime_SolarTime(tomorrow, coordinates);
const polarCircleResolver = calculationParameters.polarCircleResolution;
if ((!isValidDate(sunriseTime) || !isValidDate(sunsetTime) || isNaN(tomorrowSolarTime.sunrise)) && polarCircleResolver !== PolarCircleResolution.Unresolved) {
const resolved = polarCircleResolvedValues(polarCircleResolver, date, coordinates);
solarTime = resolved.solarTime;
tomorrowSolarTime = resolved.tomorrowSolarTime;
const dateComponents = [date.getFullYear(), date.getMonth(), date.getDate()];
dhuhrTime = new TimeComponents(solarTime.transit).utcDate(...dateComponents);
sunriseTime = new TimeComponents(solarTime.sunrise).utcDate(...dateComponents);
sunsetTime = new TimeComponents(solarTime.sunset).utcDate(...dateComponents);
} // eslint-disable-next-line prefer-const
asrTime = new TimeComponents(solarTime.afternoon(Madhab_shadowLength(calculationParameters.madhab))).utcDate(date.getFullYear(), date.getMonth(), date.getDate());
const tomorrowSunrise = new TimeComponents(tomorrowSolarTime.sunrise).utcDate(tomorrow.getFullYear(), tomorrow.getMonth(), tomorrow.getDate());
const night = (tomorrowSunrise - sunsetTime) / 1000;
fajrTime = new TimeComponents(solarTime.hourAngle(-1 * calculationParameters.fajrAngle, false)).utcDate(date.getFullYear(), date.getMonth(), date.getDate()); // special case for moonsighting committee above latitude 55
if (calculationParameters.method === "MoonsightingCommittee" && coordinates.latitude >= 55) {
nightFraction = night / 7;
fajrTime = dateByAddingSeconds(sunriseTime, -nightFraction);
}
const safeFajr = function () {
if (calculationParameters.method === "MoonsightingCommittee") {
return src_Astronomical.seasonAdjustedMorningTwilight(coordinates.latitude, DateUtils_dayOfYear(date), date.getFullYear(), sunriseTime);
} else {
const portion = calculationParameters.nightPortions().fajr;
nightFraction = portion * night;
return dateByAddingSeconds(sunriseTime, -nightFraction);
}
}();
if (fajrTime === null || isNaN(fajrTime.getTime()) || safeFajr > fajrTime) {
fajrTime = safeFajr;
}
if (calculationParameters.ishaInterval > 0) {
ishaTime = dateByAddingMinutes(sunsetTime, calculationParameters.ishaInterval);
} else {
ishaTime = new TimeComponents(solarTime.hourAngle(-1 * calculationParameters.ishaAngle, true)).utcDate(date.getFullYear(), date.getMonth(), date.getDate()); // special case for moonsighting committee above latitude 55
if (calculationParameters.method === "MoonsightingCommittee" && coordinates.latitude >= 55) {
nightFraction = night / 7;
ishaTime = dateByAddingSeconds(sunsetTime, nightFraction);
}
const safeIsha = function () {
if (calculationParameters.method === "MoonsightingCommittee") {
return src_Astronomical.seasonAdjustedEveningTwilight(coordinates.latitude, DateUtils_dayOfYear(date), date.getFullYear(), sunsetTime, calculationParameters.shafaq);
} else {
const portion = calculationParameters.nightPortions().isha;
nightFraction = portion * night;
return dateByAddingSeconds(sunsetTime, nightFraction);
}
}();
if (ishaTime == null || isNaN(ishaTime.getTime()) || safeIsha < ishaTime) {
ishaTime = safeIsha;
}
}
maghribTime = sunsetTime;
if (calculationParameters.maghribAngle) {
const angleBasedMaghrib = new TimeComponents(solarTime.hourAngle(-1 * calculationParameters.maghribAngle, true)).utcDate(date.getFullYear(), date.getMonth(), date.getDate());
if (sunsetTime < angleBasedMaghrib && ishaTime > angleBasedMaghrib) {
maghribTime = angleBasedMaghrib;
}
}
const fajrAdjustment = (calculationParameters.adjustments.fajr || 0) + (calculationParameters.methodAdjustments.fajr || 0);
const sunriseAdjustment = (calculationParameters.adjustments.sunrise || 0) + (calculationParameters.methodAdjustments.sunrise || 0);
const dhuhrAdjustment = (calculationParameters.adjustments.dhuhr || 0) + (calculationParameters.methodAdjustments.dhuhr || 0);
const asrAdjustment = (calculationParameters.adjustments.asr || 0) + (calculationParameters.methodAdjustments.asr || 0);
const maghribAdjustment = (calculationParameters.adjustments.maghrib || 0) + (calculationParameters.methodAdjustments.maghrib || 0);
const ishaAdjustment = (calculationParameters.adjustments.isha || 0) + (calculationParameters.methodAdjustments.isha || 0);
this.fajr = roundedMinute(dateByAddingMinutes(fajrTime, fajrAdjustment), calculationParameters.rounding);
this.sunrise = roundedMinute(dateByAddingMinutes(sunriseTime, sunriseAdjustment), calculationParameters.rounding);
this.dhuhr = roundedMinute(dateByAddingMinutes(dhuhrTime, dhuhrAdjustment), calculationParameters.rounding);
this.asr = roundedMinute(dateByAddingMinutes(asrTime, asrAdjustment), calculationParameters.rounding);
this.maghrib = roundedMinute(dateByAddingMinutes(maghribTime, maghribAdjustment), calculationParameters.rounding);
this.isha = roundedMinute(dateByAddingMinutes(ishaTime, ishaAdjustment), calculationParameters.rounding);
}
timeForPrayer(prayer) {
if (prayer === src_Prayer.Fajr) {
return this.fajr;
} else if (prayer === src_Prayer.Sunrise) {
return this.sunrise;
} else if (prayer === src_Prayer.Dhuhr) {
return this.dhuhr;
} else if (prayer === src_Prayer.Asr) {
return this.asr;
} else if (prayer === src_Prayer.Maghrib) {
return this.maghrib;
} else if (prayer === src_Prayer.Isha) {
return this.isha;
} else {
return null;
}
}
currentPrayer(date) {
if (typeof date === 'undefined') {
date = new Date();
}
if (date >= this.isha) {
return src_Prayer.Isha;
} else if (date >= this.maghrib) {
return src_Prayer.Maghrib;
} else if (date >= this.asr) {
return src_Prayer.Asr;
} else if (date >= this.dhuhr) {
return src_Prayer.Dhuhr;
} else if (date >= this.sunrise) {
return src_Prayer.Sunrise;
} else if (date >= this.fajr) {
return src_Prayer.Fajr;
} else {
return src_Prayer.None;
}
}
nextPrayer(date) {
if (typeof date === 'undefined') {
date = new Date();
}
if (date >= this.isha) {
return src_Prayer.None;
} else if (date >= this.maghrib) {
return src_Prayer.Isha;
} else if (date >= this.asr) {
return src_Prayer.Maghrib;
} else if (date >= this.dhuhr) {
return src_Prayer.Asr;
} else if (date >= this.sunrise) {
return src_Prayer.Dhuhr;
} else if (date >= this.fajr) {
return src_Prayer.Sunrise;
} else {
return src_Prayer.Fajr;
}
}
}
// CONCATENATED MODULE: ./src/HighLatitudeRule.js
const HighLatitudeRule = {
MiddleOfTheNight: 'middleofthenight',
SeventhOfTheNight: 'seventhofthenight',
TwilightAngle: 'twilightangle',
recommended(coordinates) {
if (coordinates.latitude > 48) {
return HighLatitudeRule.SeventhOfTheNight;
} else {
return HighLatitudeRule.MiddleOfTheNight;
}
}
};
/* harmony default export */ var src_HighLatitudeRule = (HighLatitudeRule);
// CONCATENATED MODULE: ./src/CalculationParameters.js
class CalculationParameters_CalculationParameters {
constructor(methodName, fajrAngle, ishaAngle, ishaInterval, maghribAngle) {
// Name of the method, can be used to apply special behavior in calculations.
// This property should not be manually modified.
this.method = methodName || "Other"; // Angle of the sun below the horizon used for calculating Fajr.
this.fajrAngle = fajrAngle || 0; // Angle of the sun below the horizon used for calculating Isha.
this.ishaAngle = ishaAngle || 0; // Minutes after Maghrib to determine time for Isha
// if this value is greater than 0 then ishaAngle is not used.
this.ishaInterval = ishaInterval || 0; // Angle of the sun below the horizon used for calculating Maghrib.
// Only used by the Tehran method to account for lightness in the sky.
this.maghribAngle = maghribAngle; // Madhab to determine how Asr is calculated.
this.madhab = Madhab.Shafi; // Rule to determine the earliest time for Fajr and latest time for Isha
// needed for high latitude locations where Fajr and Isha may not truly exist
// or may present a hardship unless bound to a reasonable time.
this.highLatitudeRule = src_HighLatitudeRule.MiddleOfTheNight; // Manual adjustments (in minutes) to be added to each prayer time.
this.adjustments = {
fajr: 0,
sunrise: 0,
dhuhr: 0,
asr: 0,
maghrib: 0,
isha: 0
}; // Adjustments set by a calculation method. This value should not be manually modified.
this.methodAdjustments = {
fajr: 0,
sunrise: 0,
dhuhr: 0,
asr: 0,
maghrib: 0,
isha: 0
}; // Rule to determine how to resolve prayer times inside the Polar Circle
// where daylight or night may persist for more than 24 hours depending
// on the season