Birth Chart Calculator – Sun, Moon & Rising Sign, Free

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Birth Chart Calculator

Discover your Big Three — Sun ☀️, Moon 🌙 and Rising ⬆️ signs — from your birth date, time and location. Plus element, modality and a full zodiac date reference. Free, instant, and nothing you enter ever leaves your browser.

✓ Sun · Moon · Rising · ✓ Element & Modality · ✓ Private

✨ Your Big Three

🔧 JS ⏳ · Input — · Chart — · Engine ⏳

Date of birth

Time of birth (local)

UTC offset at birth (UTC−10:00) (UTC−9:00) (UTC−8:00) (UTC−7:00) (UTC−6:00) (UTC−5:00) (UTC−4:00) (UTC−3:00) (UTC+0:00) (UTC+1:00) (UTC+2:00) (UTC+3:00) (UTC+4:00) (UTC+5:00) (UTC+5:30) (UTC+6:00) (UTC+7:00) (UTC+8:00) (UTC+9:00) (UTC+10:00) (UTC+11:00) (UTC+12:00)

Birth latitude (°N+, °S−)

☀️ SUN

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🌙 MOON

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⬆️ RISING

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Sun element

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Sun modality

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Sun ruler

🧮 How It Was Calculated

⚠️ Moon and Rising positions are astronomical approximations (mean lunar motion, simplified sidereal time) — accurate for most births but a birth near a sign boundary (±1–2 days for the Moon, minutes for the Rising) could differ from a professional ephemeris. Sun sign is exact.

Zodiac Sign Dates Reference

Sign	Symbol	Date range	Element	Modality
Aries	♈	Mar 21 – Apr 19	Fire	Cardinal
Taurus	♉	Apr 20 – May 20	Earth	Fixed
Gemini	♊	May 21 – Jun 20	Air	Mutable
Cancer	♋	Jun 21 – Jul 22	Water	Cardinal
Leo	♌	Jul 23 – Aug 22	Fire	Fixed
Virgo	♍	Aug 23 – Sep 22	Earth	Mutable
Libra	♎	Sep 23 – Oct 22	Air	Cardinal
Scorpio	♏	Oct 23 – Nov 21	Water	Fixed
Sagittarius	♐	Nov 22 – Dec 21	Fire	Mutable
Capricorn	♑	Dec 22 – Jan 19	Earth	Cardinal
Aquarius	♒	Jan 20 – Feb 18	Air	Fixed
Pisces	♓	Feb 19 – Mar 20	Water	Mutable

What Are the Big Three in Astrology?

Your Sun sign is your core identity — the self you're becoming. Your Moon sign governs emotions, instincts and what you need to feel safe. Your Rising sign (Ascendant) is the mask and first impression — how you appear and approach the world. Together they're called the Big Three, and most astrologers consider them more defining than any single placement: someone with a fiery Leo Sun but a quiet Cancer Moon and Virgo Rising expresses that fire very differently than a Leo Sun with an Aries Moon and Sagittarius Rising.

The Rising sign changes roughly every two hours, which is why birth time matters so much — it's the reason two people born the same day can have completely different charts. The Moon moves a full sign every 2–3 days, so late-evening births near a Moon transition can also land on either side.

Why Use This Birth Chart Calculator?

☀️

Exact Sun Sign

Date-table based — no approximations on the sign everyone checks.

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Moon Sign Included

The emotional core most free tools skip — computed from real lunar motion.

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Rising Sign

Ascendant from birth time and latitude — the two-hour sign most tools gate.

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Element + Modality

Fire/Earth/Air/Water and Cardinal/Fixed/Mutable for every placement.

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100% Private

Birth data is the most personal data there is — it never leaves your browser.

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Instant & Offline

Astronomical math runs locally — no account, no limits, no loading.

Popular Use Cases

• ⬆️ Finally answer "what is my rising sign?" with your real birth time
• 🌙 Find your Moon sign for emotional-pattern readings
• 🎁 Look up friends' and partners' Big Three before a reading
• 🎓 Learn how the Ascendant rotates through signs every two hours
• 📝 Prepare Sun-Moon-Rising combos for deeper astrology study
• 🔮 Check element balance (fire-heavy? water-heavy?) at a glance

Pro Tips for Accurate Results

• Birth time is everything for the Rising sign: it changes every ~2 hours. Check your birth certificate — hospital records usually list the exact minute.
• Use the time zone in effect at your birth: wartime or daylight-saving offsets matter. If you were born in summer in a DST country, add one hour to the standard offset.
• Moon boundary warning: if the result says you're within a day or two of a Moon sign change, verify with a professional ephemeris before committing to that Moon sign.
• Sun sign is the exception: it's exact from the date alone — time and location don't change it.
• Read the Big Three together: Sun is who you're becoming, Moon is what you need, Rising is how you walk in the door. A chart is a conversation between them.

Frequently Asked Questions

A tool that converts your birth date, time and location into astrological placements. This calculator computes the Big Three — Sun, Moon and Rising signs — plus element and modality, entirely in your browser with no signup and no data sent anywhere.

The Rising sign (Ascendant) is the zodiac sign ascending on the eastern horizon at your birth moment. Because the Earth rotates, the entire zodiac sweeps past the horizon every 24 hours — each sign rises for about two hours. Without an accurate birth time, the Rising sign can't be determined, which is why it's the most "you-specific" of the Big Three.

The Moon completes a zodiac circuit every ~27.3 days, moving about 13.2° per day. This calculator uses the standard mean-lunar-longitude method from your birth date and Universal Time — accurate to within roughly 2° for most dates. If your birth falls within about a day of a Moon sign change, double-check with a professional ephemeris.

Accuracy depends on the method and your birth data quality. For the Big Three, this calculator's Sun is exact and Moon/Rising use standard astronomical approximations — reliable unless you were born right on a transition. Full professional charts (all planets, houses, aspects) use Swiss Ephemeris-grade data and a precise birth location.

A stellium means three or more planets clustered in one sign or house. This tool covers the Big Three, so it can show if your Sun, Moon and Rising all share an element — a related pattern. A full stellium check needs all ten planets, which requires a professional-grade chart from complete ephemeris data.

The Ascendant depends on your angle to the ecliptic, which changes with latitude — someone born in Stockholm and someone born in Singapore at the same moment can have different Rising signs. A rough latitude (your city's, rounded) is plenty for sign-level accuracy.

Your Sun sign stays exact, and you can still get a reasonable Moon sign (it moves slowly enough that a midday guess is often right). The Rising sign is the casualty — without a time, many astrologers default to noon, which puts the Rising roughly at the Sun's position but is genuinely uncertain.

No. The math is JavaScript in your browser — your birth date, time and latitude never leave your device. There's no account, no storage, and refreshing the page clears everything.