“Why is my Vedic sign different?” — because it is, on 80% of days
Western astrology uses the tropical zodiac, anchored to the seasons (Aries begins at the March equinox). Jyotish uses the siderealzodiac, anchored to the stars. The two agreed around 1,700 years ago; Earth's slow axial wobble (precession, ~1° every 72 years) has since pulled them about 24° apart — nearly a full sign.
So we computed it: the actual sidereal Sun position (Lahiri ayanamsa, JPL DE421 ephemeris) for every day of 2024, against the conventional Western dates. The two systems named a different sign on 292 of 365 days (80%). If you know your Western sun sign, there is roughly a four-in-five chance your Vedic Sun sign is the previous sign.
| Western (tropical) sign | Days in 2024 | Days the sidereal sign differs |
|---|---|---|
| Aries | 30 | 24 (80%) |
| Taurus | 31 | 25 (81%) |
| Gemini | 31 | 25 (81%) |
| Cancer | 32 | 25 (78%) |
| Leo | 31 | 25 (81%) |
| Virgo | 31 | 25 (81%) |
| Libra | 30 | 24 (80%) |
| Scorpio | 30 | 24 (80%) |
| Sagittarius | 30 | 24 (80%) |
| Capricorn | 28 | 23 (82%) |
| Aquarius | 30 | 24 (80%) |
| Pisces | 31 | 24 (77%) |
What this means for your reading
Neither system is “wrong” — they measure different things. But it does mean a Vedic reading usually starts from a different Sun sign, Moon sign, and rising sign than you expect. In Jyotish the Moon sign and nakshatra carry most of the personal weight anyway — check yours with the free Kundli tool.
Method: Sidereal (Lahiri) Sun sign computed daily at 12:00 UTC through 2024 vs the conventional Western tropical date ranges. Computed 2026-07-14. Cite with a link to this page.