Sun Sign Calculator

Why your Vedic sign is not the sign you were told

Both zodiacs cut the ecliptic into twelve equal 30-degree signs. They disagree about where the first one starts. The tropical zodiac begins at the vernal equinox - the point where the Sun crosses the celestial equator each March. The sidereal zodiac begins from a fixed reference among the stars and stays with them.

The equinox is not fixed. It drifts backwards through the constellations by roughly 50 arcseconds a year, a motion called the precession of the equinoxes, and it has been drifting since the two zodiacs were last aligned. The accumulated distance between them is the ayanamsha, and today it is about 24 degrees.

The Sun covers a little under one degree a day, so about 24 degrees of separation works out to about 24 days of solar motion. That is why a birthday in the last week of a Western sign almost always lands in the previous rashi in the Vedic reckoning. Nothing has been miscalculated: the two systems are measuring from different starting points, and this tool shows both so you can see the offset rather than pick a side.

What this calculator gives you

• The sidereal (Vedic) rashi of the Sun, with the exact degree and minute it held within that sign.
• The tropical (Western) sign beside it, clearly labelled as Western - never presented as Vedic.
• The ayanamsha value in degrees for your birth moment, and the same quantity expressed as days of the Sun's motion.
• The two sankranti instants that bound your rashi: when the Sun entered it, and when it leaves.
• A warning when your birth falls within a day of a sankranti, where a date alone cannot settle the sign.

When the date alone is not enough

The Sun changes sign once a month, at an instant called a sankranti. On roughly one day in thirty, a birth falls close enough to that instant that the date by itself cannot decide the sign - the answer depends on the hour, and on which time zone the hour was recorded in.

This calculator does not guess in that situation. It computes the sankranti instants on either side of your birth date, and if the nearest one is within a day it says so and asks for your birth time and place before giving a verdict. The place is used only for its time zone: the Sun's ecliptic longitude is the same for every observer on Earth at a given instant, so where you were born cannot change which sign it was in - only what the clock on the wall said.

Your Sun sign is not what a Vedic horoscope is read from

This is worth saying plainly, because the whole industry blurs it. Classical Vedic prediction is reckoned from the janma rashi - the sign the MOON occupied at birth - not the Sun's. The gochara chapter of Phaladeepika (26.1) counts every transit from that sign, and the daily, weekly and monthly readings on this site follow the same rule, which means your Sun rashi is not the sign to read them under.

So this page deliberately stops at the fact. It tells you which sign the Sun was in, in both frames, to the arcminute, and then points you to a free kundli, where the Moon's sign is computed from your birth time and place. That is the number a Vedic reading actually needs.