Moon Sign Calculator

Rashi, janma rashi, chandra rashi: one sign under three names

All three names point at the same placement. Rashi is simply the Sanskrit word for a sign of the zodiac, but in everyday Indian usage “my rashi” means the Moon's sign at birth; janma rashi spells out that it is the birth sign, and chandra rashi that it belongs to the Moon. The twelve are Mesha (मेष, Aries), Vrishabha (वृषभ, Taurus), Mithuna (मिथुन, Gemini), Karka (कर्क, Cancer), Simha (सिंह, Leo), Kanya (कन्या, Virgo), Tula (तुला, Libra), Vrishchika (वृश्चिक, Scorpio), Dhanu (धनु, Sagittarius), Makara (मकर, Capricorn), Kumbha (कुंभ, Aquarius) and Meena (मीन, Pisces), each 30° wide and each owned by one planet.

The sign is reckoned in the sidereal zodiac, anchored to the stars, with whichever ayanamsa is set in the form — Lahiri unless you change it — and that is also the frame the weekly rashifal on this site is written in.

Some families also use a naam rashi, taken from the first syllable of a given name through the syllables assigned to each nakshatra pada. That is a naming convention, not a position in the sky, and it need not match the janma rashi computed here.

How often a birth date is enough

The Moon is the fastest body in the chart. Its daily motion swings between roughly 12° and 15° depending on where it is in its orbit, so it crosses the 30° of one sign in somewhere between two and two and a half days. Twelve sign changes fall inside every sidereal month of about 27⅓ days, and since no single date can hold two of them, roughly four dates in nine contain a change of rashi at some hour and the other five do not.

On those five dates the Moon's sign is the same from the first minute of the day to the last, so anyone born on one can find their moon sign by date of birth with no time at all. On the other four, the answer turns on whether the birth came before or after the crossing, which can fall at any hour.

The nakshatra is another matter. At only 13°20′ wide it changes roughly once a day, so a date alone often fixes the rashi and seldom fixes the birth star.

What the page does when the birth time is blank

Choose “I don't know my birth time” and the calculation runs twice, for 00:00 and for 23:59 local time at the birthplace. Because the Moon never moves backwards through the signs, those two ends of the day are enough: if they agree, the Moon held that sign for the whole day and the page gives it as your rashi, with a note saying whether the nakshatra held as well.

If the two ends disagree, the Moon changed sign that day, and the page shows both signs and says why rather than quietly picking one. It does not assume noon, sunrise or any other stand-in time: on a crossing day a guess would be wrong a large share of the time, with nothing on screen to say so. If the family remembers roughly when in the day the birth came, running the form with that approximate time, and again an hour or two either side of it, often settles it.

The worked example: a Moon that had only just arrived

For the illustrative chart the Moon stands at Aquarius 3°18′ at 05:30. In Sanskrit that is Kumbha (कुंभ in Hindi), a sign owned by Saturn. The degree falls in Dhanishta, whose third pada runs from Aquarius 0°00′ to 3°20′, and Dhanishta's Vimshottari lord is Mars — so the result carries two lords that are easy to confuse: Saturn for the sign, Mars for the star.

Run the same date with the time left blank and the page reports the two ends of the day. At 00:00 the Moon was at Aquarius 0°02′, two arcminutes past the border with Capricorn; moving at about 35 arcminutes an hour, it had crossed only a few minutes before midnight. At 23:59 it stood at Aquarius 14°13′ in Shatabhisha pada 3. The sign held all day, so Kumbha is a safe answer for a 13 December birth without a time — but the Moon passed through five padas and two nakshatras that day, so the star is not.

Two more details show how narrow the margins can be. At 05:30 the Moon was within two arcminutes of the line between Dhanishta's third and fourth padas, a few minutes of clock time. And on 15 December 1961 the Moon left Aquarius for Pisces in the small hours, so a birth that day with no recorded time is shown as Kumbha or Meena.

Why Vedic astrology reads so much from the Moon

Brihat Parasara Hora Sastra describes the twelve signs in its fourth chapter, and its seventh chapter tells the reader to judge several houses from the Moon as well as from the lagna. In practice that turns the Moon's sign into a second starting point, the chandra lagna: count the houses from the rashi instead of from the rising sign and you get another view of the same chart, one that does not depend on an exact birth time.

That second view is what most public Indian astrology runs on. A weekly rashifal is written for the twelve Moon signs, because the rashi is the one personal reference a reader can know without a full chart, and Saturn's sade sati is counted from the natal Moon. The result links to the weekly horoscope for your rashi and to the guide for your nakshatra; the separate nakshatra calculator goes further into the birth star.

Where a Moon sign stops being informative

Everyone born within the same two-odd days shares a rashi, so on its own it is a coarse marker. It says which sign the Moon was in. It says nothing about which house that sign occupies, what the Moon is joined by, or which dasha is running, and a reading written for a Moon sign is written for one reader in twelve.

Near a boundary the answer is only as good as its inputs. A Moon in the first or last degree of a sign can cross the border if the birth time was rounded to the half-hour or a different ayanamsa is chosen. Check, too, that the recorded time is local clock time at the birthplace: a time noted in another zone moves the Moon by roughly half a degree for every hour of error.

What is my rashi if I don't know my birth time?

Enter the date and place and choose the unknown-time option. The calculator looks at the Moon at the first and last minute of that local day. When both moments give the same sign, that sign is your rashi whatever hour you were born. When they differ, the Moon changed sign during the day, and the page lists both candidates instead of guessing, so you can decide between them from what your family remembers.

Is rashi the same as moon sign?

In Vedic usage, yes. When someone in India asks for your rashi, they mean the sidereal sign the Moon occupied at birth, also called the janma rashi or chandra rashi. Strictly, rashi means any of the twelve signs, so the Sun and the lagna each have a rashi too, but the bare word almost always refers to the Moon's.

Why does a Western astrology app show a different moon sign?

Western astrology places the Moon in the tropical zodiac, measured from the March equinox. Vedic astrology uses the sidereal zodiac, measured from a point fixed against the stars. The two starting points are currently about 24° apart, so a Western app usually puts the same Moon in the next sign along. Each is correct within its own system; rashifal and nakshatras belong to the sidereal one.

Can two people born on the same day have different rashis?

Yes, when the Moon changed sign that day. A baby born before the crossing takes one rashi and a baby born after it takes the next, even in the same hospital. On a date when the Moon stays inside one sign from midnight to midnight, every birth shares the rashi, though the nakshatra and its pada can still differ from hour to hour.

Which planet rules my rashi?

The luminaries own one sign each, the Sun Leo and the Moon Cancer, and the five other planets own two apiece: Mercury has Gemini and Virgo, Venus has Taurus and Libra, Mars has Aries and Scorpio, Jupiter has Sagittarius and Pisces, and Saturn has Capricorn and Aquarius. The result shows that rashi lord beside a second planet, the Vimshottari ruler of the Moon's nakshatra, which belongs to the star rather than the sign.

Does the ayanamsa setting change my moon sign?

Only near a sign boundary. Switching ayanamsa shifts every sidereal position by the difference between the two values: under a degree and a half from Lahiri for most of the options in the form, about three to four degrees for the rest. A Moon in the middle of a sign stays put; a Moon within a degree or two of either edge can move into the neighbouring rashi, so the setting is worth checking in that case.