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authorAlexanderCurl <alexc@alexc.hu>2026-04-18 17:46:06 +0100
committerAlexanderCurl <alexc@alexc.hu>2026-04-18 17:46:06 +0100
commit70ca3fef77ee8bdc6e3ac28589a6fa08c024cc69 (patch)
treeab1123d4067c1b086dd6faa7ee4ea643236b565a /raveos-hyprland-theme/theme-data/DankMaterialShell/quickshell/Common/suncalc.js
parent5d94c0a7d44a2255b81815a52a7056a94a39842d (diff)
downloadRaveOS-PKGBUILD-70ca3fef77ee8bdc6e3ac28589a6fa08c024cc69.tar.gz
RaveOS-PKGBUILD-70ca3fef77ee8bdc6e3ac28589a6fa08c024cc69.zip
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+.pragma library
+// Copyright (c) 2025, Vladimir Agafonkin
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+// conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+// of conditions and the following disclaimer in the documentation and/or other materials
+// provided with the distribution.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+// COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+// TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// shortcuts for easier to read formulas
+
+const PI = Math.PI,
+ sin = Math.sin,
+ cos = Math.cos,
+ tan = Math.tan,
+ asin = Math.asin,
+ atan = Math.atan2,
+ acos = Math.acos,
+ rad = PI / 180;
+
+// sun calculations are based on https://aa.quae.nl/en/reken/zonpositie.html formulas
+
+// date/time constants and conversions
+
+const dayMs = 1000 * 60 * 60 * 24,
+ J1970 = 2440588,
+ J2000 = 2451545;
+
+function toJulian(date) { return date.valueOf() / dayMs - 0.5 + J1970; }
+function fromJulian(j) { return new Date((j + 0.5 - J1970) * dayMs); }
+function toDays(date) { return toJulian(date) - J2000; }
+
+
+// general calculations for position
+
+const e = rad * 23.4397; // obliquity of the Earth
+
+function rightAscension(l, b) { return atan(sin(l) * cos(e) - tan(b) * sin(e), cos(l)); }
+function declination(l, b) { return asin(sin(b) * cos(e) + cos(b) * sin(e) * sin(l)); }
+
+function azimuth(H, phi, dec) { return atan(sin(H), cos(H) * sin(phi) - tan(dec) * cos(phi)); }
+function altitude(H, phi, dec) { return asin(sin(phi) * sin(dec) + cos(phi) * cos(dec) * cos(H)); }
+
+function siderealTime(d, lw) { return rad * (280.16 + 360.9856235 * d) - lw; }
+
+function astroRefraction(h) {
+ if (h < 0) // the following formula works for positive altitudes only.
+ h = 0; // if h = -0.08901179 a div/0 would occur.
+
+ // formula 16.4 of "Astronomical Algorithms" 2nd edition by Jean Meeus (Willmann-Bell, Richmond) 1998.
+ // 1.02 / tan(h + 10.26 / (h + 5.10)) h in degrees, result in arc minutes -> converted to rad:
+ return 0.0002967 / Math.tan(h + 0.00312536 / (h + 0.08901179));
+}
+
+// general sun calculations
+
+function solarMeanAnomaly(d) { return rad * (357.5291 + 0.98560028 * d); }
+
+function eclipticLongitude(M) {
+
+ const C = rad * (1.9148 * sin(M) + 0.02 * sin(2 * M) + 0.0003 * sin(3 * M)), // equation of center
+ P = rad * 102.9372; // perihelion of the Earth
+
+ return M + C + P + PI;
+}
+
+function sunCoords(d) {
+
+ const M = solarMeanAnomaly(d),
+ L = eclipticLongitude(M);
+
+ return {
+ dec: declination(L, 0),
+ ra: rightAscension(L, 0)
+ };
+}
+
+
+// calculates sun position for a given date and latitude/longitude
+
+function getPosition(date, lat, lng) {
+
+ const lw = rad * -lng,
+ phi = rad * lat,
+ d = toDays(date),
+
+ c = sunCoords(d),
+ H = siderealTime(d, lw) - c.ra;
+
+ return {
+ azimuth: azimuth(H, phi, c.dec),
+ altitude: altitude(H, phi, c.dec)
+ };
+};
+
+
+// sun times configuration (angle, morning name, evening name)
+
+const times = [
+ [-0.833, 'sunrise', 'sunset'],
+ [-0.3, 'sunriseEnd', 'sunsetStart'],
+ [-6, 'dawn', 'dusk'],
+ [-12, 'nauticalDawn', 'nauticalDusk'],
+ [-18, 'nightEnd', 'night'],
+ [6, 'goldenHourEnd', 'goldenHour']
+];
+
+// adds a custom time to the times config
+
+function addTime(angle, riseName, setName) {
+ times.push([angle, riseName, setName]);
+};
+
+
+// calculations for sun times
+
+const J0 = 0.0009;
+
+function julianCycle(d, lw) { return Math.round(d - J0 - lw / (2 * PI)); }
+
+function approxTransit(Ht, lw, n) { return J0 + (Ht + lw) / (2 * PI) + n; }
+function solarTransitJ(ds, M, L) { return J2000 + ds + 0.0053 * sin(M) - 0.0069 * sin(2 * L); }
+
+function hourAngle(h, phi, d) { return acos((sin(h) - sin(phi) * sin(d)) / (cos(phi) * cos(d))); }
+function observerAngle(height) { return -2.076 * Math.sqrt(height) / 60; }
+
+// returns set time for the given sun altitude
+function getSetJ(h, lw, phi, dec, n, M, L) {
+
+ const w = hourAngle(h, phi, dec),
+ a = approxTransit(w, lw, n);
+ return solarTransitJ(a, M, L);
+}
+
+
+// calculates sun times for a given date, latitude/longitude, and, optionally,
+// the observer height (in meters) relative to the horizon
+
+function getTimes(date, lat, lng, height) {
+
+ height = height || 0;
+
+ const lw = rad * -lng,
+ phi = rad * lat,
+ dh = observerAngle(height),
+ d = toDays(date),
+ n = julianCycle(d, lw),
+ ds = approxTransit(0, lw, n),
+ M = solarMeanAnomaly(ds),
+ L = eclipticLongitude(M),
+ dec = declination(L, 0),
+ Jnoon = solarTransitJ(ds, M, L);
+
+ const result = {
+ solarNoon: fromJulian(Jnoon),
+ nadir: fromJulian(Jnoon - 0.5)
+ };
+
+ for (const time of times) {
+ const h0 = (time[0] + dh) * rad;
+ const Jset = getSetJ(h0, lw, phi, dec, n, M, L);
+ const Jrise = Jnoon - (Jset - Jnoon);
+
+ result[time[1]] = fromJulian(Jrise);
+ result[time[2]] = fromJulian(Jset);
+ }
+
+ return result;
+};
+
+
+// moon calculations, based on http://aa.quae.nl/en/reken/hemelpositie.html formulas
+
+function moonCoords(d) { // geocentric ecliptic coordinates of the moon
+
+ const L = rad * (218.316 + 13.176396 * d), // ecliptic longitude
+ M = rad * (134.963 + 13.064993 * d), // mean anomaly
+ F = rad * (93.272 + 13.229350 * d), // mean distance
+
+ l = L + rad * 6.289 * sin(M), // longitude
+ b = rad * 5.128 * sin(F), // latitude
+ dt = 385001 - 20905 * cos(M); // distance to the moon in km
+
+ return {
+ ra: rightAscension(l, b),
+ dec: declination(l, b),
+ dist: dt
+ };
+}
+
+function getMoonPosition(date, lat, lng) {
+
+ const lw = rad * -lng,
+ phi = rad * lat,
+ d = toDays(date),
+ c = moonCoords(d),
+ H = siderealTime(d, lw) - c.ra,
+ h = altitude(H, phi, c.dec),
+ // formula 14.1 of "Astronomical Algorithms" 2nd edition by Jean Meeus (Willmann-Bell, Richmond) 1998.
+ pa = atan(sin(H), tan(phi) * cos(c.dec) - sin(c.dec) * cos(H));
+
+ return {
+ azimuth: azimuth(H, phi, c.dec),
+ altitude: h + astroRefraction(h), // altitude correction for refraction,
+ distance: c.dist,
+ parallacticAngle: pa
+ };
+};
+
+
+// calculations for illumination parameters of the moon,
+// based on http://idlastro.gsfc.nasa.gov/ftp/pro/astro/mphase.pro formulas and
+// Chapter 48 of "Astronomical Algorithms" 2nd edition by Jean Meeus (Willmann-Bell, Richmond) 1998.
+
+function getMoonIllumination(date) {
+
+ const d = toDays(date || new Date()),
+ s = sunCoords(d),
+ m = moonCoords(d),
+
+ sdist = 149598000, // distance from Earth to Sun in km
+
+ phi = acos(sin(s.dec) * sin(m.dec) + cos(s.dec) * cos(m.dec) * cos(s.ra - m.ra)),
+ inc = atan(sdist * sin(phi), m.dist - sdist * cos(phi)),
+ angle = atan(cos(s.dec) * sin(s.ra - m.ra), sin(s.dec) * cos(m.dec) -
+ cos(s.dec) * sin(m.dec) * cos(s.ra - m.ra));
+
+ return {
+ fraction: (1 + cos(inc)) / 2,
+ phase: 0.5 + 0.5 * inc * (angle < 0 ? -1 : 1) / Math.PI,
+ angle
+ };
+};
+
+
+function hoursLater(date, h) {
+ return new Date(date.valueOf() + h * dayMs / 24);
+}
+
+// calculations for moon rise/set times are based on http://www.stargazing.net/kepler/moonrise.html article
+
+function getMoonTimes(date, lat, lng, inUTC) {
+ const t = new Date(date);
+ if (inUTC) t.setUTCHours(0, 0, 0, 0);
+ else t.setHours(0, 0, 0, 0);
+
+ const hc = 0.133 * rad;
+ let h0 = getMoonPosition(t, lat, lng).altitude - hc,
+ rise, set, ye;
+
+ // go in 2-hour chunks, each time seeing if a 3-point quadratic curve crosses zero (which means rise or set)
+ for (let i = 1; i <= 24; i += 2) {
+ const h1 = getMoonPosition(hoursLater(t, i), lat, lng).altitude - hc;
+ const h2 = getMoonPosition(hoursLater(t, i + 1), lat, lng).altitude - hc;
+ const a = (h0 + h2) / 2 - h1;
+ const b = (h2 - h0) / 2;
+ const xe = -b / (2 * a);
+ const d = b * b - 4 * a * h1;
+ let roots = 0, x1 = 0, x2 = 0;
+ ye = (a * xe + b) * xe + h1;
+
+ if (d >= 0) {
+ const dx = Math.sqrt(d) / (Math.abs(a) * 2);
+ x1 = xe - dx;
+ x2 = xe + dx;
+ if (Math.abs(x1) <= 1) roots++;
+ if (Math.abs(x2) <= 1) roots++;
+ if (x1 < -1) x1 = x2;
+ }
+
+ if (roots === 1) {
+ if (h0 < 0) rise = i + x1;
+ else set = i + x1;
+
+ } else if (roots === 2) {
+ rise = i + (ye < 0 ? x2 : x1);
+ set = i + (ye < 0 ? x1 : x2);
+ }
+
+ if (rise && set) break;
+
+ h0 = h2;
+ }
+
+ const result = {};
+
+ if (rise) result.rise = hoursLater(t, rise);
+ if (set) result.set = hoursLater(t, set);
+
+ if (!rise && !set) result[ye > 0 ? 'alwaysUp' : 'alwaysDown'] = true;
+
+ return result;
+};