Udaya Lagna Calculator [ 2025-2027 ]

function getNakshatra(siderealDeg) // 27 Nakshatra each 13°20' = 13.3333333° const nakshatras = [ "Ashwini", "Bharani", "Krittika", "Rohini", "Mrigashira", "Ardra", "Punarvasu", "Pushya", "Ashlesha", "Magha", "Purva Phalguni", "Uttara Phalguni", "Hasta", "Chitra", "Swati", "Vishakha", "Anuradha", "Jyeshtha", "Mula", "Purva Ashadha", "Uttara Ashadha", "Shravana", "Dhanishtha", "Shatabhisha", "Purva Bhadrapada", "Uttara Bhadrapada", "Reverti" ]; let nakshatraLen = 360 / 27; // 13.3333333 let idx = Math.floor(siderealDeg / nakshatraLen); let startDeg = idx * nakshatraLen; let pada = Math.floor(((siderealDeg - startDeg) / (nakshatraLen / 4))) + 1; return `$nakshatras[idx] (Pada $pada)`;

// Sidereal zodiac boundaries (Nirayana) - tropical sign boundaries minus ayanamsha. // Lahiri Ayanamsha for given JD. function getLahiriAyanamsha(jd) // Approx formula: 23° 26' 21.406" - t/76 ? Actually use astronomia's built-in precise calculation // astronomia has ayanamsha for sidereal positions. We'll compute directly with function. // Use astronomia's siderealTime? Better: compute tropical ascendant then subtract ayanamsha. const obliquity = astronomia.obliquity(jd); // Mean Ayanamsha formula by IAU 1976 / Lahiri: ~ 23° 26' 21.406" – (precession) but for simple we use astronomia's precession // However, astronomia's ayanamsha is not directly exposed but we can compute using mean longitude of sun - sidereal sun? Let's use built-in: // astronomia.ayanamsha() is not in this bundle, but we use: // modern lahiri = 23° 26' 21.406" - ( (JD - 2451545)/36525 * 50.290966 )/3600 approx. // More accurate: use precise precession from astronomia. const t = (jd - 2451545) / 36525; // Julian centuries since J2000 const precessionRateArcsec = 50.290966; // arcsec/year? Actually per century: 5029.0966 arcsec? no, 50.290966 arcsec/year. Let's do per tropical century: const precessionPerCenturyDeg = (5029.0966) / 3600; // in degrees per Julian century let ayan = precessionPerCenturyDeg * t; // base offset at J2000 = 23° 51' 21.406"?? No, correct Lahiri at J2000 is about 23.856° approx // We'll use standard known value: Lahiri ayanamsha for J2000 = 23° 51' 21.406" = 23.855946° const ayanJ2000 = 23.855946; let ayanamshaDeg = ayanJ2000 + precessionPerCenturyDeg * t; // but more stable: ensure we return degrees. return (ayanamshaDeg + 360) % 360; Udaya Lagna Calculator

// initial load demo for Mumbai (async () => const initCity = cityInput.value; const coords = await geocodeCity(initCity); if(coords) currentCoords = coords; latField.value = coords.lat.toFixed(4); lonField.value = coords.lon.toFixed(4); )(); Better: compute tropical ascendant then subtract ayanamsha