Vedic Calculator
Your Vedic Moon sign (Rashi), birth star (Nakshatra) and first Mahadasha all come from one number: where the Moon actually was when you were born, measured against the stars. This calculator works that position out with real astronomy, a simplified lunar theory for the Moon’s longitude minus the Lahiri ayanamsa, instead of guessing from your birth date alone. Enter your birth date, time and birthplace longitude and pick Rashi, Nakshatra or Mahadasha.
The example is pre-filled with a published birth chart you can check below: 17 September 1950, 11:00 AM, longitude 72.64 (Vadnagar, Gujarat).
Quick Answer
For the pre-filled example, 17 September 1950 at 11:00 AM in Vadnagar (longitude 72.64), the Moon’s sidereal longitude is 219.21°, giving Rashi: Scorpio (Vrishchika), Nakshatra: Anuradha, pada 2, and a birth period of Saturn Mahadasha with 10 years 7 months of it left at birth. Switch the Calculation Type and click Calculate to see each result from the same Moon position.
Key takeaways
- In Vedic astrology the Rashi is the Moon’s sign, not the Sun’s, and it is read from the sidereal (star-based) zodiac.
- One computed Moon longitude produces all three outputs: the 30° segment is the Rashi, the 13°20′ segment is the Nakshatra, and the Nakshatra’s lord opens the Vimshottari Mahadasha sequence.
- Birth time matters: the Moon moves about 13° a day, so a few hours can change the Nakshatra or its pada.
- This tool computes the Moon only. A full kundli with Lagna, houses and all nine grahas needs an ephemeris chart, and our sidereal birth chart calculator covers that wider sidereal picture.
- Quick Answer
- How to use this Vedic calculator
- The method: how the Moon’s position is really computed
- Worked example: a published chart, reproduced
- Checked against published birth charts
- The 12 Rashis and the Vimshottari cycle
- What full kundli calculators do that this one does not
- About the old Name Compatibility mode
- Limits to know before you rely on a result
- Frequently asked questions
How to use this Vedic calculator
Pick what you want to find, enter your birth date, time and birthplace longitude, and click Calculate. All three modes read the same computed Moon position, so your Rashi, Nakshatra and Mahadasha always agree with each other.
- Choose the Calculation Type. Rashi (Zodiac Sign) for your Moon sign, Nakshatra for your birth star and pada, or Mahadasha Period for your Vimshottari timeline.
- Enter your birth date and local birth time. Use the time on your birth certificate if you have it; hospital records beat family memory.
- Enter your birthplace longitude. Decimal degrees, east positive and west negative. A map search for your birth town shows its longitude; Indian cities sit between about 68° and 97° east.
- Click Calculate. The result box shows the headline answer plus the Moon’s sidereal longitude, so you can cross-check it against any published kundli.
The method: how the Moon’s position is really computed
The calculator runs a simplified lunar theory, converts the result to the sidereal zodiac with the Lahiri ayanamsa, and then reads the Rashi, Nakshatra and dasha off that single longitude. Nothing is derived from the day or month by arithmetic shortcuts.
- Lunar theory. The Moon’s longitude comes from its orbital elements with the major perturbation terms (evection, variation and the yearly equation) applied, the low-precision method published by Paul Schlyter and used by amateur astronomers for decades. Against full ephemeris values it lands within a few tenths of a degree in the reference checks below.
- Lahiri ayanamsa. Vedic astrology measures against the fixed stars, so the tool subtracts the ayanamsa, the gap between the tropical and sidereal zodiacs. The Lahiri value, the Indian calendar standard named for astronomer N. C. Lahiri, is about 23.85° at the year 2000 and grows about 50.3 arc-seconds a year; the tool evaluates it for your birth date rather than using one fixed number.
- Rashi and Nakshatra. The sidereal circle is split into 12 signs of 30° and 27 nakshatras of 13°20′. Each nakshatra splits into 4 padas of 3°20′. Your Moon’s segment in each division is your Rashi, Nakshatra and pada.
- Vimshottari Mahadasha. Each nakshatra has a ruling planet in a fixed 9-planet cycle. You are born part-way through that planet’s period: the share left, called the balance, is the fraction of the nakshatra the Moon still had to cross, times the planet’s full period. The tool then walks the cycle forward in the classical order and reports which Mahadasha is running today, using 365.25-day years.
An earlier version of this page did none of this: it picked a Rashi from the birth month and day by arithmetic and a Nakshatra from the day of the month alone, ignoring the year, the time and the place entirely. Two people born on the same calendar day in different years got identical charts. That placeholder math has been replaced, and the verification table below shows the new engine against published charts.
Worked example: a published chart, reproduced
The pre-filled example is the widely published birth data of Narendra Modi: 17 September 1950, 11:00 AM, Vadnagar in Gujarat (longitude 72.64° east). Published kundli analyses give his Moon sign as Scorpio, his birth nakshatra as Anuradha pada 2, and his current period as a Mars Mahadasha. The tool reproduces all three.
| Quantity | Tool output | Published chart |
|---|---|---|
| Moon sidereal longitude | 219.21° | 218.05° at the 09:35 birth-time variant (see checks below) |
| Rashi | Scorpio (Vrishchika) | Scorpio |
| Nakshatra and pada | Anuradha, pada 2 (5.88° into the star) | Anuradha, pada 2 |
| Mahadasha at birth | Saturn, balance 10 years 7 months, runs to 2 May 1961 | Saturn (Anuradha is Saturn-ruled) |
| Mahadasha running in October 2026 | Mars, to 2 May 2028 | Mars Mahadasha |
Checked against published birth charts
Before this rebuild was accepted, the engine was run against three well-documented births whose charts are published with degrees. Sign, nakshatra and pada matched in every case.
| Birth | Published sidereal Moon | This tool |
|---|---|---|
| Narendra Modi, 17 Sep 1950, 09:35 variant, Vadnagar (72.64°E) | 218.05°, Scorpio, Anuradha pada 2 | 218.36°, Scorpio, Anuradha pada 2 |
| Mahatma Gandhi, 2 Oct 1869, 07:08, Porbandar (69.6°E) | Cancer, Ashlesha (from the published tropical Moon at 139.93° Leo minus the 1869 ayanamsa) | 117.91°, Cancer (Karka), Ashlesha pada 4 |
| Albert Einstein, 14 Mar 1879, 11:30, Ulm (10.0°E) | Scorpio, Jyeshtha (published tropical Moon 254.53° minus the 1879 Lahiri ayanamsa of 22.16° gives 232.37°) | 232.36°, Scorpio, Jyeshtha pada 2 |
The Modi rows also show the honest limit of the method. Sources disagree on his birth time (09:35 in some published charts, 11:00 in others), and the two times move the computed Moon by about 0.85°, yet the Rashi, Nakshatra and pada come out identical, because Anuradha is 13°20′ wide. The remaining gap to the published 218.05° is the local-mean-time conversion: this tool turns local time into universal time from longitude alone, while a full chart uses the civil time zone (IST is UT+5:30, about 40 minutes ahead of Vadnagar’s mean solar time). Treat any result within about half a degree of a boundary as provisional and confirm it with an ephemeris kundli.
The 12 Rashis and the Vimshottari cycle
Your Rashi is fixed by which 30° sidereal segment holds the Moon, and your dasha sequence is fixed by your nakshatra’s lord. Both reference tables below are exactly what the tool uses.
| Rashi | Sidereal span | Element | Ruling planet |
|---|---|---|---|
| Aries (Mesha) | 0–30° | Fire | Mars |
| Taurus (Vrishabha) | 30–60° | Earth | Venus |
| Gemini (Mithuna) | 60–90° | Air | Mercury |
| Cancer (Karka) | 90–120° | Water | Moon |
| Leo (Simha) | 120–150° | Fire | Sun |
| Virgo (Kanya) | 150–180° | Earth | Mercury |
| Libra (Tula) | 180–210° | Air | Venus |
| Scorpio (Vrishchika) | 210–240° | Water | Mars |
| Sagittarius (Dhanu) | 240–270° | Fire | Jupiter |
| Capricorn (Makara) | 270–300° | Earth | Saturn |
| Aquarius (Kumbha) | 300–330° | Air | Saturn |
| Pisces (Meena) | 330–360° | Water | Jupiter |
The Vimshottari cycle runs Ketu (7 years), Venus (20), Sun (6), Moon (10), Mars (7), Rahu (18), Jupiter (16), Saturn (19), Mercury (17), then back to Ketu: 120 years in total. The nakshatra lords follow the same order, starting with Ashwini under Ketu, so your birth star alone fixes where in the cycle your life begins. Our sidereal zodiac calculator shows the same sidereal framework applied to the Sun and other placements.
What full kundli calculators do that this one does not
Full kundli services compute every graha, the Lagna, houses and divisional charts from an ephemeris, and several do it well. This page deliberately covers only the Moon-based core, and says so, because a smaller tool with honest math beats a wide one with invented numbers.
- What competitors get right: ephemeris engines (Swiss Ephemeris class) place the Moon to the arc-minute, use your civil time zone, and add the Lagna, all nine grahas, houses and a dasha timeline with antardashas. If you need a marriage-matching or a full reading, that is the right class of tool.
- Where many of them go quiet: the method is rarely printed, the ayanamsa is sometimes not named, and sign-up walls or PDF upsells arrive before the basic Moon sign does. None of them show a check against published charts on the page.
- What this page does instead: the formula is printed above, the ayanamsa is named (Lahiri), the Moon’s sidereal longitude is shown with every result so you can verify it anywhere, and the three reference-chart checks are on the page. What it will not give you is a Lagna or houses: those need latitude and a precise time-zone conversion, and bolting on approximations would recreate the problem this rebuild removed. For the tropical counterpart of this Moon work, see our Taurus birth chart calculator, which computes Sun, Moon and rising signs with the same family of formulas.
About the old Name Compatibility mode
The old version of this page listed a Name Compatibility mode that never worked: it had no name fields at all and answered every click with a request to enter both names. That mode has been removed rather than repaired, because there is no classical Vedic method that scores two names in isolation, and inventing a scoring table would be exactly the kind of made-up output this page no longer ships.
Real Vedic compatibility work (kundli matching, or guna milan) compares the two people’s Moon positions: their nakshatras, padas and Moon signs, scored through the Ashtakoota system. You can do the genuine first step here: run this calculator once with each person’s birth date, time and longitude, note both Nakshatra results, and only then consult a matching table or an astrologer with two real charts in hand. A score built from two computed Moons means something; a score built from two typed names does not.
Limits to know before you rely on a result
Three simplifications bound this tool’s accuracy, and each one is stated rather than hidden. Near a boundary, they decide the answer, so read your margin before you read your sign.
- Simplified lunar theory. The Moon’s longitude is typically within a few tenths of a degree of ephemeris values (0.01° to 0.31° across the three published-chart checks above). A pada is 3°20′ wide, so padas are safe except within roughly half a degree of an edge.
- Local mean solar time. Birth time is converted from longitude (15° per hour), not from your civil time zone. Where the zone time runs far ahead of solar time, the Moon can shift by up to about half a degree. This is the largest single error source.
- Dasha dates are approximate. Periods are counted in 365.25-day years from the birth date, as most printed dasha tables do, but some traditions count differently, so end dates can differ by weeks between systems. The running Mahadasha’s identity is far more stable than its exact end date.
- Entertainment framing. Astrology’s interpretive claims are a tradition, not a measurement. In Shawn Carlson’s double-blind test published in Nature in 1985, professional astrologers matched birth charts to personality profiles at chance level. Use these results for reflection, and make life decisions on evidence.
Frequently asked questions
Your Rashi is your Moon sign: the sidereal zodiac sign the Moon occupied at your birth. Vedic astrology treats the Moon, not the Sun, as the primary sign because it governs the birth nakshatra and the dasha timeline. This calculator finds it from the Moon’s computed sidereal longitude, the 30 degree segment of the zodiac that longitude falls in.
It divides the Moon’s sidereal longitude by 13 degrees 20 minutes, the width of one nakshatra. The segment it lands in is your birth star, and its quarter (3 degrees 20 minutes each) is your pada. For example, a sidereal Moon at 219.21 degrees falls in Anuradha, pada 2.
Western astrology uses the tropical zodiac, anchored to the seasons, while Vedic astrology uses the sidereal zodiac, anchored to the stars. Precession has drifted them apart by roughly 24 degrees, the ayanamsa, so a sidereal placement usually sits one sign earlier than the tropical one. Both systems describe the same sky; they measure it from different starting points.
It is a 120-year cycle of planetary periods in a fixed order: Ketu 7 years, Venus 20, Sun 6, Moon 10, Mars 7, Rahu 18, Jupiter 16, Saturn 19 and Mercury 17. You are born part-way through the period ruled by your birth nakshatra’s lord, and the fraction of that nakshatra the Moon had already crossed decides how much of the first period remains, called the balance.
The Moon’s longitude uses a simplified lunar theory that matched published charts within 0.01 to 0.31 degrees in the reference checks on this page, which is well inside a sign or nakshatra. Two simplifications set the limit: your birth time is converted using longitude (local mean solar time) rather than your civil time zone, and the lunar theory is not a full ephemeris. If your Moon falls within about half a degree of a boundary, confirm the result with an ephemeris-based kundli.
Because the Moon moves about 13 degrees a day, roughly half a degree an hour. A date alone can place it anywhere within a 13 degree stretch, which can span two nakshatras. Your birth time fixes where in that stretch it was, and your longitude converts that local time toward universal time so the position can be computed.
It was removed. The old mode had no name inputs and no method behind it, and there is no classical Vedic technique that scores two names on their own. Real compatibility matching compares two birth charts, starting with each person’s Moon sign and nakshatra, which you can compute here for both people before using a matching table.
No. Vedic astrology is a long tradition of interpretation, and its astronomical inputs, the real positions of the Moon and planets, are genuine, but its interpretive claims have not held up under controlled testing. In a double-blind study published in Nature in 1985, astrologers matched natal charts to personality profiles no better than chance. Treat the results as reflection and entertainment, not as evidence for decisions.
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References
- Paul Schlyter, Stockholm, Sweden. How to Compute Planetary Positions (low-precision solar and lunar orbital elements and the lunar perturbation terms this tool’s Moon longitude is built from). Accessed October 24, 2026.
- Astrodienst. AstroWiki: Ayanamsha (the Lahiri ayanamsa, named for N. C. Lahiri and adopted for the Indian calendar, is the sidereal correction subtracted from the Moon’s tropical longitude here). Accessed October 24, 2026.
- NASA Science. Moon Facts (the Moon orbits Earth in about 27.3 days, which is why it crosses roughly one nakshatra a day and why birth time changes the result). Accessed October 24, 2026.
- Shawn Carlson. A double-blind test of astrology, Nature 318(6045), 419–425 (1985) (professional astrologers matched natal charts to personality profiles at a level consistent with chance). Accessed October 24, 2026.
- Astrodienst. AstroWiki: Nakshatra (the 27 lunar mansions of 13°20′ each, their ruling planets in the Vimshottari order, and the four padas per nakshatra). Accessed October 24, 2026.