[{"_1":2,"_3":-5,"_4":-5},"loaderData",{"_5":6,"_7":8},"actionData","errors","root",{"_106":107,"_108":109},"routes/embed.x.$handle.$name.$",{"_9":10,"_11":12,"_13":14,"_15":16,"_17":18,"_19":20,"_21":22},"handle","stumasondev","name","nightsky","path","gen/sky_js.ts","project",{"_23":48,"_11":12,"_36":49,"_50":-5,"_51":44,"_52":53,"_54":53,"_55":56,"_57":-5,"_58":59,"_60":61,"_62":35,"_63":-5,"_64":-5,"_65":39,"_66":67,"_68":-5,"_69":-5,"_70":-5,"_71":-5,"_72":73,"_74":73,"_75":76,"_77":76,"_78":76,"_79":73,"_80":73,"_81":82,"_83":84,"_85":86,"_87":44},"file",{"_23":24,"_11":25,"_26":27,"_28":29,"_30":31,"_32":33,"_34":35,"_36":37,"_38":39,"_40":17,"_41":42,"_43":44,"_45":-5,"_13":46},"permalink","https://www.val.town/x/stumasondev/nightsky/code/gen/sky_js.ts","extension","ts","id","8db20cdf-7702-49c5-b28e-e114091c74ed","sky_js.ts","fileId","59dc34a4-b11a-11f1-9b20-1607ee4eb77e","parentId","584aa45e-b11a-11f1-b08e-1607ee4eb77e","branchId","f2e78115-0e3e-45eb-862c-94e339fa734f","branchVersion",6,"latest",true,"createdAt",["D",1789486215978],"version",0,"fileType","content","export default \"/* Nightsky Poster — sky rendering engine (browser, no deps)\\n Data: HYG v4.1 (CC BY-SA 4.0, astronexus), constellation lines from d3-celestial (BSD-3).\\n Maths: Meeus, Astronomical Algorithms (sidereal time ch.12, precession ch.21, alt/az ch.13). */\\n(function (global) {\\n const D2R = Math.PI / 180, R2D = 180 / Math.PI;\\n\\n // ---- time ----------------------------------------------------------------\\n function tzOffsetMinutes(utcMs, tz) {\\n try {\\n const f = new Intl.DateTimeFormat('en-US', { timeZone: tz, hourCycle: 'h23',\\n year: 'numeric', month: '2-digit', day: '2-digit', hour: '2-digit', minute: '2-digit', second: '2-digit' });\\n const p = {};\\n for (const x of f.formatToParts(new Date(utcMs))) p[x.type] = x.value;\\n const asUTC = Date.UTC(+p.year, +p.month - 1, +p.day, +p.hour, +p.minute, +p.second);\\n return Math.round((asUTC - utcMs) / 60000);\\n } catch (e) { return 0; }\\n }\\n // wall-clock (y,m,d,h,mi) in IANA tz -> UTC ms\\n function wallToUTC(y, m, d, h, mi, tz) {\\n let guess = Date.UTC(y, m - 1, d, h, mi, 0);\\n let off = tzOffsetMinutes(guess, tz);\\n let utc = guess - off * 60000;\\n off = tzOffsetMinutes(utc, tz);\\n return guess - off * 60000;\\n }\\n function julianDate(utcMs) { return 2440587.5 + utcMs / 86400000; }\\n function gmstDeg(jd) {\\n const T = (jd - 2451545.0) / 36525;\\n let g = 280.46061837 + 360.98564736629 * (jd - 2451545.0) + 0.000387933 * T * T - T * T * T / 38710000;\\n g %= 360; if (g < 0) g += 360; return g;\\n }\\n\\n // ---- precession J2000 -> date (Meeus 21.3/21.4) -----------------------------\\n function precessor(jd) {\\n const T = (jd - 2451545.0) / 36525;\\n const s = 1 / 3600;\\n const zeta = (2306.2181 * T + 0.30188 * T * T + 0.017998 * T * T * T) * s * D2R;\\n const z = (2306.2181 * T + 1.09468 * T * T + 0.018203 * T * T * T) * s * D2R;\\n const th = (2004.3109 * T - 0.42665 * T * T - 0.041833 * T * T * T) * s * D2R;\\n const cth = Math.cos(th), sth = Math.sin(th);\\n return function (raDeg, decDeg) {\\n const a0 = raDeg * D2R + zeta, d0 = decDeg * D2R;\\n const cd = Math.cos(d0), sd = Math.sin(d0), ca = Math.cos(a0), sa = Math.sin(a0);\\n const A = cd * sa, B = cth * cd * ca - sth * sd, C = sth * cd * ca + cth * sd;\\n let ra = Math.atan2(A, B) + z; if (ra < 0) ra += 2 * Math.PI;\\n const dec = Math.asin(Math.max(-1, Math.min(1, C)));\\n return [ra, dec]; // radians\\n };\\n }\\n\\n // ---- projection ------------------------------------------------------------\\n // Returns projector: (raRad, decRad) -> {x,y,alt} in unit disc (horizon r=1), N up, E left.\\n function projector(utcMs, latDeg, lonDeg) {\\n const jd = julianDate(utcMs);\\n const lst = (gmstDeg(jd) + lonDeg) * D2R;\\n const phi = latDeg * D2R, sphi = Math.sin(phi), cphi = Math.cos(phi);\\n const prec = precessor(jd);\\n function ofDate(ra, dec) {\\n const H = lst - ra;\\n const sdec = Math.sin(dec), cdec = Math.cos(dec), cH = Math.cos(H), sH = Math.sin(H);\\n const sinAlt = sphi * sdec + cphi * cdec * cH;\\n const alt = Math.asin(Math.max(-1, Math.min(1, sinAlt)));\\n // azimuth from North through East\\n const az = Math.atan2(-sH * cdec, cphi * sdec - sphi * cdec * cH); // N=0, E=+90deg\\n const r = (Math.PI / 2 - alt) / (Math.PI / 2); // azimuthal equidistant\\n return { x: -r * Math.sin(az), y: -r * Math.cos(az), alt: alt * R2D, az: ((az * R2D) + 360) % 360, r };\\n }\\n const f = function (raDeg, decDeg) { const [ra, dec] = prec(raDeg, decDeg); return ofDate(ra, dec); };\\n f.ofDate = ofDate;\\n return f;\\n }\\n\\n\\n // ---- Sun, Moon, planets (Schlyter low-precision elements; equinox of date) ----------\\n function bodies(utcMs) {\\n const d = julianDate(utcMs) - 2451543.5;\\n const rev = x => { x %= 360; return x < 0 ? x + 360 : x; };\\n const sin = x => Math.sin(x * D2R), cos = x => Math.cos(x * D2R);\\n const ecl = 23.4393 - 3.563e-7 * d;\\n function kepler(M, e) { let E = M + e * R2D * sin(M) * (1 + e * cos(M)); for (let i = 0; i < 8; i++) { const dE = (E - e * R2D * sin(E) - M) / (1 - e * cos(E)); E -= dE; if (Math.abs(dE) < 1e-6) break; } return E; }\\n function orbit(el) { // -> heliocentric (or geocentric for moon) ecliptic rect coords + v\\n const E = kepler(el.M, el.e);\\n const xv = el.a * (cos(E) - el.e), yv = el.a * Math.sqrt(1 - el.e * el.e) * sin(E);\\n const v = Math.atan2(yv, xv) * R2D, r = Math.sqrt(xv * xv + yv * yv);\\n const vw = v + el.w;\\n return { x: r * (cos(el.N) * cos(vw) - sin(el.N) * sin(vw) * cos(el.i)), y: r * (sin(el.N) * cos(vw) + cos(el.N) * sin(vw) * cos(el.i)), z: r * sin(vw) * sin(el.i), r };\\n }\\n // Sun\\n const ws = 282.9404 + 4.70935e-5 * d, es = 0.016709 - 1.151e-9 * d, Ms = rev(356.0470 + 0.9856002585 * d);\\n const Es = kepler(Ms, es), xvs = cos(Es) - es, yvs = Math.sqrt(1 - es * es) * sin(Es);\\n const vs = Math.atan2(yvs, xvs) * R2D, rs = Math.sqrt(xvs * xvs + yvs * yvs), lons = rev(vs + ws);\\n const xs = rs * cos(lons), ys = rs * sin(lons);\\n const toEq = (x, y, z) => { const ye = y * cos(ecl) - z * sin(ecl), ze = y * sin(ecl) + z * cos(ecl); return { ra: Math.atan2(ye, x), dec: Math.atan2(ze, Math.sqrt(x * x + ye * ye)), dist: Math.sqrt(x * x + y * y + z * z) }; };\\n const sun = toEq(xs, ys, 0);\\n // Moon\\n const mo = { N: rev(125.1228 - 0.0529538083 * d), i: 5.1454, w: rev(318.0634 + 0.1643573223 * d), a: 60.2666, e: 0.054900, M: rev(115.3654 + 13.0649929509 * d) };\\n let m = orbit(mo);\\n let lon = Math.atan2(m.y, m.x) * R2D, lat = Math.atan2(m.z, Math.sqrt(m.x * m.x + m.y * m.y)) * R2D, rm = m.r;\\n const Ls = Ms + ws, Lm = mo.M + mo.w + mo.N, D = Lm - Ls, F = Lm - mo.N, Mm = mo.M;\\n lon += -1.274 * sin(Mm - 2 * D) + 0.658 * sin(2 * D) - 0.186 * sin(Ms) - 0.059 * sin(2 * Mm - 2 * D) - 0.057 * sin(Mm - 2 * D + Ms) + 0.053 * sin(Mm + 2 * D) + 0.046 * sin(2 * D - Ms) + 0.041 * sin(Mm - Ms) - 0.035 * sin(D) - 0.031 * sin(Mm + Ms) - 0.015 * sin(2 * F - 2 * D) + 0.011 * sin(Mm - 4 * D);\\n lat += -0.173 * sin(F - 2 * D) - 0.055 * sin(Mm - F - 2 * D) - 0.046 * sin(Mm + F - 2 * D) + 0.033 * sin(F + 2 * D) + 0.017 * sin(2 * Mm + F);\\n rm += -0.58 * cos(Mm - 2 * D) - 0.46 * cos(2 * D);\\n const moonEq = toEq(rm * cos(lon) * cos(lat), rm * sin(lon) * cos(lat), rm * sin(lat));\\n // elongation & illuminated fraction\\n const elong = Math.acos(Math.max(-1, Math.min(1, Math.sin(sun.dec) * Math.sin(moonEq.dec) + Math.cos(sun.dec) * Math.cos(moonEq.dec) * Math.cos(sun.ra - moonEq.ra))));\\n const moon = { ra: moonEq.ra, dec: moonEq.dec, k: (1 - Math.cos(elong)) / 2, parallax: Math.asin(1 / rm), elong };\\n // Planets\\n const P = {\\n Mercury: { N: 48.3313 + 3.24587e-5 * d, i: 7.0047 + 5.00e-8 * d, w: 29.1241 + 1.01444e-5 * d, a: 0.387098, e: 0.205635 + 5.59e-10 * d, M: rev(168.6562 + 4.0923344368 * d) },\\n Venus: { N: 76.6799 + 2.46590e-5 * d, i: 3.3946 + 2.75e-8 * d, w: 54.8910 + 1.38374e-5 * d, a: 0.723330, e: 0.006773 - 1.302e-9 * d, M: rev(48.0052 + 1.6021302244 * d) },\\n Mars: { N: 49.5574 + 2.11081e-5 * d, i: 1.8497 - 1.78e-8 * d, w: 286.5016 + 2.92961e-5 * d, a: 1.523688, e: 0.093405 + 2.516e-9 * d, M: rev(18.6021 + 0.5240207766 * d) },\\n Jupiter: { N: 100.4542 + 2.76854e-5 * d, i: 1.3030 - 1.557e-7 * d, w: 273.8777 + 1.64505e-5 * d, a: 5.20256, e: 0.048498 + 4.469e-9 * d, M: rev(19.8950 + 0.0830853001 * d) },\\n Saturn: { N: 113.6634 + 2.38980e-5 * d, i: 2.4886 - 1.081e-7 * d, w: 339.3939 + 2.97661e-5 * d, a: 9.55475, e: 0.055546 - 9.499e-9 * d, M: rev(316.9670 + 0.0334442282 * d) },\\n };\\n const Mj = P.Jupiter.M, Msa = P.Saturn.M;\\n const planets = [];\\n for (const name of Object.keys(P)) {\\n const h = orbit(P[name]);\\n let plon = Math.atan2(h.y, h.x) * R2D, plat = Math.atan2(h.z, Math.sqrt(h.x * h.x + h.y * h.y)) * R2D;\\n if (name === 'Jupiter') plon += -0.332 * sin(2 * Mj - 5 * Msa - 67.6) - 0.056 * sin(2 * Mj - 2 * Msa + 21) + 0.042 * sin(3 * Mj - 5 * Msa + 21) - 0.036 * sin(Mj - 2 * Msa) + 0.022 * cos(Mj - Msa) + 0.023 * sin(2 * Mj - 3 * Msa + 52) - 0.016 * sin(Mj - 5 * Msa - 69);\\n if (name === 'Saturn') { plon += 0.812 * sin(2 * Mj - 5 * Msa - 67.6) - 0.229 * cos(2 * Mj - 4 * Msa - 2) + 0.119 * sin(Mj - 2 * Msa - 3) + 0.046 * sin(2 * Mj - 6 * Msa - 69) + 0.014 * sin(Mj - 3 * Msa + 32); plat += -0.020 * cos(2 * Mj - 4 * Msa - 2) + 0.018 * sin(2 * Mj - 6 * Msa - 49); }\\n const xh = h.r * cos(plon) * cos(plat), yh = h.r * sin(plon) * cos(plat), zh = h.r * sin(plat);\\n const eq = toEq(xh + xs, yh + ys, zh);\\n planets.push({ name, ra: eq.ra, dec: eq.dec });\\n }\\n return { sun, moon, planets };\\n }\\n\\n // ---- themes ----------------------------------------------------------------\\n const THEMES = {\\n midnight: { bg: '#0b1630', ink: '#f4f1e8', star: '#ffffff', line: 'rgba(244,241,232,0.35)', grid: 'rgba(244,241,232,0.10)', rim: 'rgba(244,241,232,0.55)', sky: '#0e1c3f' },\\n noir: { bg: '#000000', ink: '#ffffff', star: '#ffffff', line: 'rgba(255,255,255,0.32)', grid: 'rgba(255,255,255,0.09)', rim: 'rgba(255,255,255,0.5)', sky: '#050505' },\\n paper: { bg: '#f6f1e6', ink: '#1a1a1a', star: '#1a1a1a', line: 'rgba(26,26,26,0.35)', grid: 'rgba(26,26,26,0.10)', rim: 'rgba(26,26,26,0.55)', sky: '#f6f1e6' },\\n forest: { bg: '#0f2a22', ink: '#f2ead7', star: '#fff8e7', line: 'rgba(242,234,215,0.35)', grid: 'rgba(242,234,215,0.10)', rim: 'rgba(242,234,215,0.55)', sky: '#123329' },\\n };\\n function starColor(ci, theme) {\\n if (theme === 'paper') return '#1a1a1a';\\n if (ci < 0.0) return '#cfe0ff';\\n if (ci < 0.3) return '#e6eeff';\\n if (ci < 0.8) return '#ffffff';\\n if (ci < 1.3) return '#fff2d6';\\n return '#ffd9b0';\\n }\\n function esc(s) { return String(s).replace(/&/g, '&').replace(//g, '>').replace(/\\\"/g, '"'); }\\n\\n // ---- render ----------------------------------------------------------------\\n // cfg: {lat, lon, tz, date:'YYYY-MM-DD', time:'HH:MM', place, title, sub, theme, lines, grid, labels, watermark}\\n // data: {stars:[[ra,dec,mag,ci,name?]], lines:[[[ra,dec],...]]}\\n function renderSVG(cfg, data, opts) {\\n opts = opts || {};\\n const W = 2000, H = 3000; // 2:3 portrait units\\n const t = THEMES[cfg.theme] || THEMES.midnight;\\n const [y, m, d] = cfg.date.split('-').map(Number);\\n const [hh, mm] = (cfg.time || '21:00').split(':').map(Number);\\n const utc = wallToUTC(y, m, d, hh, mm, cfg.tz || 'UTC');\\n const proj = projector(utc, +cfg.lat, +cfg.lon);\\n const cx = W / 2, cy = 1200, R = 850;\\n let out = [];\\n out.push(``);\\n return out.join('');\\n }\\n\\n function toPNG(svgText, width, cb) {\\n const W = width || 4000, H = W * 1.5;\\n const blob = new Blob([svgText], { type: 'image/svg+xml;charset=utf-8' });\\n const url = URL.createObjectURL(blob);\\n const img = new Image();\\n img.onload = function () {\\n const c = document.createElement('canvas'); 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