Rashi vs Sun Sign: Why Your Vedic Sign Is Different

You have always been a Scorpio. Then you open a Vedic astrology site, enter your birth details, and it tells you your Sun is in Libra and your rashi is something else again. Nothing is wrong. You have met the two differences between Western and Vedic astrology.

Difference 1: two zodiacs

Both systems divide the sky into the same twelve signs, Aries to Pisces. They differ on where Aries begins.

• The tropical zodiac, used in Western astrology, is tied to the seasons. Aries begins at the March equinox each year, wherever the stars happen to be.
• The sidereal zodiac, used in Vedic astrology (Jyotish), is tied to the fixed stars. Aries begins where the constellation is taken to begin.

About 1,700 years ago the two starting points coincided. Since then the Earth's slow wobble, called precession, has moved the equinox backwards against the stars at about one degree every 72 years. The gap between the zodiacs is called the ayanamsa. Today it is about 24 degrees, measured by the Lahiri standard that the Indian government adopted and most Indian astrologers use.

A sign is 30 degrees wide. So for roughly four people in five, every planet in the Vedic chart sits one sign earlier than in the Western chart.

What that does to your Sun sign

Western Sun sign dates run from about the 21st of one month to the 20th of the next. Vedic Sun sign dates run from about the middle of one month to the middle of the next. The Sun enters sidereal Aries around 14 April, a day marked in India as Mesha Sankranti, and moves on a sign about every 30 days.

Some examples:

• Born 25 October: Western Scorpio, Vedic Libra.
• Born 5 April: Western Aries, Vedic Pisces.
• Born 20 August: Western Leo, Vedic Leo. Dates in the later part of a Western sign keep the same sign.

Exact dates shift by a day from year to year. Each of our 12 sign pages gives the calculated Vedic Sun dates.

Difference 2: the Moon comes first

The bigger difference is which sign you are asked for at all.

In the West, "What's your sign?" means the Sun sign. In India, "What's your rashi?" means the Moon sign: the sign the Moon was in at the moment you were born.

Vedic astrology treats the Moon as the significator of the mind, so the Moon sign is taken as the centre of the personal horoscope. A great deal is counted from it:

• Rashifal. Daily, weekly, monthly and yearly horoscopes in India are written for the Moon sign.
• Nakshatra. Your birth star is the Moon's position among 27 lunar mansions, and it traditionally supplies the first letter of a baby's name.
• Sade Sati. Saturn's seven-and-a-half-year passage is counted from the Moon sign. See Sade Sati dates for every Moon sign.
• Kundli matching. The 36-point guna milan compares the Moon signs and nakshatras of two people.
• Dashas. The planetary periods of your life start from the Moon's nakshatra at birth.

So if you read an Indian horoscope under your Western Sun sign, you are quite likely reading someone else's.

Why the rashi needs your birth time

The Sun takes a month to cross a sign, so the Sun sign needs only a date. The Moon circles the whole zodiac in about 27 days and crosses a sign in roughly two and a quarter days.

That means two people born in the same week can have different rashis, and on days when the Moon changes sign, two people born hours apart can too. To find the rashi reliably you need the date, the time and the place of birth, because the place fixes the time zone.

The third sign: your lagna

A Vedic chart has one more key sign: the lagna, or rising sign, the sign coming up on the eastern horizon at birth. It changes about every two hours and sets the twelve houses of the kundli. Astrologers read the lagna for the body and the direction of life, the Moon for the mind, and the Sun for the soul and vitality.

Three signs, then, and it is common for all three to differ.

How to find your rashi

Use our free Vedic birth chart calculator. Enter your date, time and place of birth and it shows your rashi, nakshatra, lagna and every planet's sign, calculated with the Lahiri ayanamsa. The calculation runs in your browser and your details are not stored.

No birth time? Tick "I don't know my birth time" and the chart is worked out for noon. Unless the Moon changed sign on your birthday, the rashi will still be right, and the table shows the Moon's degree so you can see how close to the edge of a sign it was. The rising sign cannot be found without a time.

What about rashi by name?

In many Indian families a baby's name starts with a sound given by the birth nakshatra. Each nakshatra has four quarters and each quarter a syllable, so 108 sounds map on to the 27 nakshatras and through them to the 12 rashis. If your name was chosen like this, its first sound leads back to your rashi. Our nakshatra pages list the letters for all 108 quarters.

If your name was chosen freely, the rashi found from it is a "name rashi", which some astrologers use when the birth time is unknown. Your birth rashi can only come from your birth details.

So which sign is really mine?

Both, in the system each belongs to. The tropical and sidereal zodiacs are two different measuring frames, like Celsius and Fahrenheit, and a chart drawn in one should be read by the rules of that tradition.

If you follow Indian astrology, use your Moon sign for horoscopes and Sade Sati, your nakshatra for naming and matching, and your lagna for the chart. Your Western Sun sign is still yours for Western horoscopes.

Astrology is a tradition of symbols, offered here for reflection and cultural interest. It has not been shown to predict events, and it is no substitute for professional advice on health, law or money.