Rising Sign (Ascendant) Calculator

ANA›Life Services Authority›National Calculator Authority›Rising Sign (Ascendant) 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; } }

Rising Sign (Ascendant) Calculator

Your Rising Sign (Ascendant) is the zodiac sign that was rising on the eastern horizon at the exact moment of your birth. It shapes your outward personality and first impressions.

Birth Date

Birth Time (local time)

Birth Latitude (°, negative = South)

Birth Longitude (°, negative = West)

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

Calculate Rising Sign

function risCalc() { var resultDiv = document.getElementById('ris-result'); resultDiv.innerHTML = '';

var dateVal = document.getElementById('ris-birth-date').value.trim(); var timeVal = document.getElementById('ris-birth-time').value.trim(); var latVal = document.getElementById('ris-latitude').value.trim(); var lonVal = document.getElementById('ris-longitude').value.trim(); var utcVal = document.getElementById('ris-utc-offset').value.trim();

// --- Validation --- if (!dateVal) { resultDiv.innerHTML = 'Please enter a birth date.'; return; } if (!timeVal) { resultDiv.innerHTML = 'Please enter a birth time.'; return; } if (latVal === '') { resultDiv.innerHTML = 'Please enter a birth latitude.'; return; } if (lonVal === '') { resultDiv.innerHTML = 'Please enter a birth longitude.'; return; } if (utcVal === '') { resultDiv.innerHTML = 'Please enter a UTC offset.'; return; }

var lat = parseFloat(latVal); var lon = parseFloat(lonVal); var utcOffset = parseFloat(utcVal);

if (isNaN(lat) || lat 90) { resultDiv.innerHTML = 'Latitude must be between -90 and 90.'; return; } if (isNaN(lon) || lon 180) { resultDiv.innerHTML = 'Longitude must be between -180 and 180.'; return; } if (isNaN(utcOffset) || utcOffset 14) { resultDiv.innerHTML = 'UTC offset must be between -12 and +14.'; return; }

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

if (year 2200) { resultDiv.innerHTML = 'Year must be between 1800 and 2200.'; return; }

// Convert local time to UT var utHour = hour + min / 60.0 - utcOffset; var utDay = day; var utMonth = month; var utYear = year;

// Handle day overflow/underflow if (utHour >= 24) { utHour -= 24; utDay += 1; } if (utHour 0, add 180° if (Math.cos(RAMCr) > 0) { ascDeg = (ascDeg + 180) % 360; }

// --- Map to Zodiac Sign --- var signs = [ { name: "Aries", symbol: "♈", start: 0 }, { name: "Taurus", symbol: "♉", start: 30 }, { name: "Gemini", symbol: "♊", start: 60 }, { name: "Cancer", symbol: "♋", start: 90 }, { name: "Leo", symbol: "♌", start: 120 }, { name: "Virgo", symbol: "♍", start: 150 }, { name: "Libra", symbol: "♎", start: 180 }, { name: "Scorpio", symbol: "♏", start: 210 }, { name: "Sagittarius", symbol: "♐", start: 240 }, { name: "Capricorn", symbol: "♑", start: 270 }, { name: "Aquarius", symbol: "♒", start: 300 }, { name: "Pisces", symbol: "♓", start: 330 } ];

var signIndex = Math.floor(ascDeg / 30) % 12; var sign = signs[signIndex]; var degInSign = ascDeg - sign.start; var degPart = Math.floor(degInSign); var minPart = Math.floor((degInSign - degPart) * 60);

// Ruling planets var rulers = { "Aries": "Mars", "Taurus": "Venus", "Gemini": "Mercury", "Cancer": "Moon", "Leo": "Sun", "Virgo": "Mercury", "Libra": "Venus", "Scorpio": "Pluto/Mars", "Sagittarius": "Jupiter", "Capricorn": "Saturn", "Aquarius": "Uranus/Saturn", "Pisces": "Neptune/Jupiter" };

// Sign descriptions var descriptions = { "Aries": "Bold, energetic, and pioneering. You come across as confident and direct.", "Taurus": "Calm, reliable, and sensual. You project stability and groundedness.", "Gemini": "Curious, witty, and adaptable. You appear communicative and youthful.", "Cancer": "Nurturing, intuitive, and protective. You seem warm and empathetic.", "Leo": "Charismatic, dramatic, and generous. You radiate confidence and warmth.", "Virgo": "Analytical, modest, and precise. You appear thoughtful and detail-oriented.", "Libra": "Charming, diplomatic, and balanced. You project grace and sociability.", "Scorpio": "Intense, magnetic, and perceptive. You appear mysterious and powerful.", "Sagittarius": "Optimistic, adventurous, and philosophical. You seem free-spirited and open.", "Capricorn": "Disciplined, ambitious, and reserved. You project authority and seriousness.", "Aquarius": "Original, independent, and humanitarian. You appear unconventional and visionary.", "Pisces": "Dreamy, compassionate, and intuitive. You seem gentle and otherworldly." };

var lstHours = LST / 15.0; var lstH = Math.floor(lstHours); var lstM = Math.floor((lstHours - lstH) * 60); var lstS = Math.floor(((lstHours - lstH) * 60 - lstM) * 60);

resultDiv.innerHTML = '### Your Rising Sign ' + '' + sign.symbol + '' + '' + sign.name + ' Rising' + '' + 'Ascendant Longitude' + ascDeg.toFixed(4) + '°' + 'Position in Sign' + degPart + '° ' + minPart + '' ' + sign.name + '' + 'Ruling Planet' + rulers[sign.name] + '' + 'Local Sidereal Time' + lstH + 'h ' + lstM + 'm ' + lstS + 's' + 'Julian Date' + JD.toFixed(5) + '' + '' + '' + descriptions[sign.name] + '

'; }

#### Formula

1. Convert to Universal Time (UT): UT = Local Time − UTC Offset

2. Julian Date (JD): JD = JDN + (UT − 12) / 24 where JDN uses the proleptic Gregorian calendar formula.

3. Greenwich Mean Sidereal Time (GMST): T = (JD − 2451545.0) / 36525 GMST = 280.46061837 + 360.98564736629 × (JD − 2451545.0) + 0.000387933T² − T³/38710000 (degrees)

4. Local Sidereal Time (LST): LST = GMST + Longitude (degrees)

5. Obliquity of the Ecliptic (ε): ε = 23.439291111 − 0.013004167T − 0.000000164T² + 0.000000504T³

6. Ascendant Ecliptic Longitude: ASC = atan2(−cos(RAMC), sin(RAMC)·cos(ε) + tan(φ)·sin(ε)) where RAMC = LST (in degrees), φ = geographic latitude. Quadrant correction: if cos(RAMC) > 0, add 180°.

7. Zodiac Sign: Sign = floor(ASC / 30°) → maps to one of 12 signs (Aries = 0°–30°, etc.)

#### Assumptions & References

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References

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