Vedic Astrology Calculator
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Find your Vedic Moon sign (Rashi) from your exact birth date, time, and time zone — real sidereal lunar-position math, not a date-range lookup.
Quick answer: Your Vedic Moon sign (Rashi) is the sidereal zodiac sign the Moon occupied at your exact birth moment, corrected for the ~24° precession gap (ayanamsa) between the sidereal and tropical zodiacs. Because the Moon moves roughly 13° a day, changing sign every 2.2–2.7 days, exact birth time and time zone matter far more here than for a Sun sign.
Use your birth location's standard time offset from UTC at the time you were born, not your current time zone. If you don't know your exact birth time, use your best estimate — see why that matters below.
Your Vedic Moon Sign (Rashi)
📐 Formula
The Moon's tropical ecliptic longitude is computed from your birth date and time (converted to Universal Time using your time zone) with a simplified orbital-elements method — Paul Schlyter's widely used tutorial formula, including the Moon's three largest perturbation terms (evection, variation, and the yearly equation). The Lahiri ayanamsa (~23°51'12" on 2000-01-01, growing ~50.288 arcseconds a year) is then subtracted from that tropical longitude to get the sidereal longitude, which is divided by 30° to find your Rashi and your exact degree within it.
How to Use the Vedic Astrology Calculator
Enter your birth date
Select your birth month, day, and year — a specific year is required, since this tool computes a real lunar position rather than a fixed date range.
Enter your birth time
Type the hour and minute you were born, in 24-hour time, as precisely as you know it.
Select your time zone
Choose the UTC offset your birth location used at the time — its standard time offset, such as UTC−5:00 or UTC+5:30.
View your Vedic Moon sign instantly
See your Rashi in Sanskrit and English, plus the exact sidereal longitude and degree within the sign, updated immediately as you change any field.
Read the boundary check
If your Moon position falls within about 2 degrees of a sign boundary, an honest note explains the uncertainty instead of stating a flat result.
Vedic (Sidereal) vs. Western (Tropical) Astrology: Why Your Moon Sign Can Differ
Western astrology — including our own zodiac sign calculator and birth chart calculator — uses the tropical zodiac, which is fixed to the seasons: 0° Aries is always defined as the moment of the March equinox, regardless of which constellation the Sun actually appears in front of that day. Vedic (Jyotish) astrology instead uses the sidereal zodiac, which is fixed to the actual constellations as they appear in the sky. The two systems started out aligned in ancient times, but Earth's axis slowly wobbles over a roughly 26,000-year cycle — a motion called precession — and that wobble has pulled the tropical and sidereal reference points apart by roughly 24° today. The angular gap between them, at any given moment, is called the ayanamsa, and it's the correction this calculator subtracts from a tropical Moon position to arrive at a sidereal one.
That 24° gap is large enough to matter: it's most of an entire zodiac sign's width (each sign spans 30°). So a Moon position that would read as, say, late Taurus under the tropical system can read as mid-Aries once the ayanamsa correction is applied — same real Moon, same real moment, two different sign labels because the two systems measure the angle from different starting points. Neither system is more "correct" than the other in an absolute sense; they're two internally consistent conventions that happen to disagree by a growing amount each year, which is exactly why a page that computes a Vedic Moon sign has to say plainly which zodiac it's using and why the number can differ from a tropical calculation of the same birth data.
Why Exact Birth Time Matters So Much More for a Moon Sign Than a Sun Sign
Our other astrology tools on this site — zodiac sign, Chinese zodiac, and the sun-sign side of the birth chart calculator — only need a birth date, because the Sun moves through the zodiac slowly: about 1° a day, taking roughly a full month to cross a single 30° sign. A birth date is more than precise enough to pin down a sun sign with certainty. The Moon is a completely different case. It moves roughly 13° a day — about 13 times faster than the Sun — which means it crosses into a new sidereal sign every 2.2 to 2.7 days, not once a month. At that speed, the Moon can move about half a degree in a single hour, so a birth time that's off by even a few hours can shift the calculated longitude enough to land in the wrong sign entirely, especially near a boundary. That's also why your time zone (UTC offset) is not optional here: getting it wrong effectively shifts your reported birth time by whole hours, and each hour of error moves the calculated Moon position by roughly half a degree.
This is the central honesty point of this tool: a Sun-sign lookup is forgiving of an approximate birth date, but a Moon-sign calculation is not forgiving of an approximate birth time. If you only know your birth date and a rough sense of the time, treat the result here as a strong estimate rather than a certainty — and if the calculator flags your result as being near a sign boundary, read that note seriously rather than picking whichever sign sounds better.
The 12 Vedic Rashis and Their Sidereal Degree Ranges
Below is the full reference chart of all 12 Vedic Rashis (Moon signs), their Sanskrit and English names, their sidereal degree range, and their traditional ruling planet (graha) — the same 12 planetary rulers used in classical Western astrology, since both trace back to the same ancient tradition of assigning one ruler per sign.
| Sanskrit (Rashi) | English Sign | Sidereal Degree Range | Ruling Planet |
|---|---|---|---|
| Mesha | Aries | 0° – 30° | Mars |
| Vrishabha | Taurus | 30° – 60° | Venus |
| Mithuna | Gemini | 60° – 90° | Mercury |
| Karka | Cancer | 90° – 120° | Moon |
| Simha | Leo | 120° – 150° | Sun |
| Kanya | Virgo | 150° – 180° | Mercury |
| Tula | Libra | 180° – 210° | Venus |
| Vrishchika | Scorpio | 210° – 240° | Mars |
| Dhanu | Sagittarius | 240° – 270° | Jupiter |
| Makara | Capricorn | 270° – 300° | Saturn |
| Kumbha | Aquarius | 300° – 330° | Saturn |
| Meena | Pisces | 330° – 360° | Jupiter |
The sidereal longitude the calculator shows above is what determines which row your result falls in — a longitude of 283.5°, for instance, falls in the Makara (Capricorn) row, between 270° and 300°. Read the degree range next to your result to see exactly how close you are to either edge.
Worked Example: Born April 19, 1990, 6:15 AM in India (UTC+5:30)
For a birth of April 19, 1990 at 6:15 AM local time in a UTC+5:30 time zone, this calculator's formula returns a tropical Moon longitude of about 307.2°. Subtracting that birth date's Lahiri ayanamsa (about 23.72° in 1990) gives a sidereal longitude of about 283.5° — which falls in the 270°–300° range, making the Rashi Makara (Capricorn), about 13.5° into the sign and nowhere near a boundary. This example also anchors the calculator's underlying lunar-position formula: run against the classic 19 April 1990 Astronomical Almanac worked example (at 0h Universal Time), it reproduces the published tropical longitude of 306.9484° to within about 0.13°, consistent with this simplified method's own stated ~0.25° accuracy limit.
Worked Example (Near a Boundary): Born March 7, 1995, Noon UTC
For a birth of March 7, 1995 at 12:00 PM, UTC+0, the calculator returns a sidereal longitude of about 31.8° — just 1.8° into the Vrishabha (Taurus) range, which starts at 30°. That's inside this tool's 2° boundary-flag threshold, so rather than stating "Taurus" as a flat fact, the result page would show the honest near-boundary note: likely Vrishabha (Taurus), but close enough to the Mesha (Aries) cusp that a birth time off by an hour or so, or a different ayanamsa method, could plausibly shift the result to the neighboring sign. This is exactly the kind of case where a professional ephemeris service is worth using if the exact sign genuinely matters.
Curious how this compares to the Western tropical Moon your birth data would give? Our birth chart calculator covers the tropical sun sign, decan, and ruling planet from your birth date alone, and explains honestly why it stops short of a Moon sign or Rising sign without your birth time. If it's your Western sun sign date range you're after first, start with our zodiac sign calculator, or check how two signs pair up with our zodiac compatibility calculator. Curious about a completely different birth-year-based system? Our Chinese zodiac calculator reads your animal sign from the 12-year East Asian cycle. Or go back much further with our Mayan Day Sign Calculator, which reads your Kin number and traditional Day Sign from the 260-day Maya Tzolk'in using the same kind of honest, sourced methodology as this page's sidereal math. Browse every tool in the category on the Astrology Calculators hub.
Frequently Asked Questions
Your Rashi is the zodiac sign the Moon occupied, in the sidereal zodiac, at your exact moment of birth — the core placement in Vedic (Jyotish) astrology, the way your sun sign is the core placement in Western astrology. Because the Moon moves through the zodiac roughly 13 times faster than the Sun, your Rashi is a far more time-sensitive calculation than a sun sign: it can change every 2.2 to 2.7 days, versus about once a month for the Sun.
The Moon moves about 13 degrees per day, roughly 0.5 degrees per hour, so its zodiac position shifts noticeably within a single day. Without your birth time and the correct UTC offset for your birth location, this calculator cannot know exactly where the Moon was, and a wrong time zone shifts the calculated position by up to 15 degrees per hour of error — easily enough to land in the wrong sign entirely. A sun sign only needs a date because the Sun barely moves in a day; a Moon sign needs a time because the Moon moves fast.
Vedic astrology uses the sidereal zodiac, anchored to the actual visible constellations, while Western astrology uses the tropical zodiac, anchored to the seasons. The two have drifted apart by roughly 24 degrees since ancient times because of Earth's slow axial precession — a wobble that takes about 26,000 years to complete one cycle. This calculator subtracts that drift, called the ayanamsa, from a tropical Moon position to get a sidereal one, which is why the same birth data can land in a different sign depending on which system is used.
The ayanamsa is the angular gap between the tropical zodiac's 0-degree point and the sidereal zodiac's 0-degree point, growing by about 50.288 arcseconds a year as Earth's axis precesses. Lahiri is the ayanamsa officially adopted by the Indian government's Calendar Reform Committee and the most widely used standard in Vedic astrology software today, which is why this calculator uses it rather than one of several other ayanamsa systems in circulation.
This tool uses a simplified lunar-position formula (a widely used tutorial method, not full lunar theory) accurate to roughly a quarter of a degree, plus a linear approximation of the Lahiri ayanamsa. That's precise enough for a confident Rashi result most of the time, but if your calculated Moon position lands within about 2 degrees of a sign boundary, small errors in birth time or ayanamsa method could genuinely change the result — this calculator flags that case explicitly rather than hiding it. For a birth-time-critical use, such as matching or formal chart work, a full ephemeris service like Swiss Ephemeris is the more precise choice.
Sources & Methodology
There's no government or standards body that governs astrology, so a CDC or IRS-style citation doesn't apply here — but the underlying astronomical math does have real, checkable sources, and we cite them precisely because this is a genuinely more technical calculator than our date-lookup tools. The lunar-position formula follows Paul Schlyter's widely used "How to compute planetary positions" tutorial (stjarnhimlen.se), a simplified method that Schlyter's own documentation states is accurate to roughly 0.25° in lunar longitude when using the three largest perturbation terms — the same three terms (evection, variation, and the yearly equation) this calculator implements. We independently verified this implementation against the tutorial's own 19 April 1990 worked example (expected tropical longitude 306.9484°): our code reproduces it to within about 0.13°, comfortably inside that stated error bound. The Lahiri ayanamsa uses a linear approximation anchored to the published 2000-01-01 value of 23°51'12", per jagannathhora.com's reference table, growing at a rate of ~50.288 arcseconds a year — matching the IAU 2006 general precession rate of 5028.796195 arcseconds per century. Professional Vedic astrology software, such as Swiss Ephemeris, applies additional small non-linear corrections that this simplified linear model does not, which is a real part of why results within about 2° of a sign boundary carry extra uncertainty here and are flagged rather than stated flatly. We state all of this plainly, including the method's real limits, rather than implying more precision than a simplified formula can deliver.