Birth Chart Calculator

ANA›Life Services Authority›National Calculator Authority›Birth Chart Calculator

.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }

Birth Chart Calculator

Calculate your astrological birth chart including Sun sign, Moon sign, and Ascendant (Rising sign) based on your birth date, time, and location coordinates.

Birth Date

Birth Time (Local)

Birth Latitude (°)

Birth Longitude (°)

UTC Offset (hours, e.g. -5 for EST)

Calculate Birth Chart Enter your birth details above and click Calculate.

function birCalc() { var dateVal = document.getElementById('bir_date').value; var timeVal = document.getElementById('bir_time').value; var lat = parseFloat(document.getElementById('bir_lat').value); var lon = parseFloat(document.getElementById('bir_lon').value); var tz = parseFloat(document.getElementById('bir_tz').value); var res = document.getElementById('bir_result');

if (!dateVal || !timeVal) { res.innerHTML='Please enter a valid date and time.'; return; } if (isNaN(lat) || lat 90) { res.innerHTML='Latitude must be between -90 and 90.'; return; } if (isNaN(lon) || lon 180){ res.innerHTML='Longitude must be between -180 and 180.'; return; } if (isNaN(tz) || tz 14) { res.innerHTML='UTC offset must be between -12 and +14.'; return; }

var parts = dateVal.split('-'); var tparts = timeVal.split(':'); var year = parseInt(parts[0]); var month = parseInt(parts[1]); var day = parseInt(parts[2]); var hour = parseInt(tparts[0]); var min = parseInt(tparts[1]);

// Convert local time to UTC decimal hours var utcHour = hour + min/60.0 - tz; // Adjust date if utcHour overflows var utcDay = day; var utcMonth = month; var utcYear = year; if (utcHour >= 24) { utcHour -= 24; utcDay += 1; } if (utcHour House ' + h.num + '' + h.sign.symbol + ' ' + h.sign.name + '' + degStr(h.lon) + ''; }).join('');

res.innerHTML = '### 🌟 Your Birth Chart ' + '' + 'Planet/PointSignPositionElementModality' + '' + '☀️ Sun' + sunSign.symbol + ' ' + sunSign.name + '' + degStr(sunLon) + '' + sunElem + '' + sunMod + '' + '🌙 Moon' + moonSign.symbol + ' ' + moonSign.name + '' + degStr(moonLon) + '' + moonElem + '' + moonMod + '' + '⬆️ Ascendant' + ascSign.symbol + ' ' + ascSign.name + '' + degStr(asc) + '' + ascElem + '' + ascMod + '' + '' + '🏠 House Cusps (Equal House System)' + '' + 'HouseSignCusp' + '' + houseRows + '' + 'Julian Day: ' + JD.toFixed(4) + ' | LST: ' + LST.toFixed(4) + '° | ε: ' + eps.toFixed(4) + '°

'; }

#### Formulas Used

Julian Day Number (JDN): JD = ⌊365.25(Y+4716)⌋ + ⌊30.6001(M+1)⌋ + D + h/24 + B − 1524.5 where B = 2 − ⌊Y/100⌋ + ⌊⌊Y/100⌋/4⌋ (Gregorian correction)

Julian Centuries from J2000.0: T = (JD − 2451545.0) / 36525

Sun Longitude: L₀ = 280.46646° + 36000.76983°·T (mean longitude) M = 357.52911° + 35999.05029°·T (mean anomaly) C = (1.914602 − 0.004817T)sin M + 0.019993 sin 2M + 0.000289 sin 3M λ☉ = L₀ + C

Moon Longitude: L′ = 218.3165° + 481267.8813°·T (mean longitude) Perturbation terms summed from Meeus Table 47a λ☽ = L′ + Σ corrections

Ascendant: θ₀ = 280.46061837° + 360.98564736629°·(JD − 2451545) (GMST) LST = θ₀ + λ (local sidereal time) ASC = atan2(−cos LST, sin LST·cos ε + tan φ·sin ε) where ε = 23.439291° − 0.013004°·T (obliquity), φ = latitude

Zodiac Sign: sign index = ⌊λ / 30⌋ (0=Aries … 11=Pisces)

#### Assumptions & References

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References

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