Why it differs from your Western sign
Two things change at once. Vedic astrology reads the Moon rather than the Sun, and it measures against the sidereal zodiac fixed to the stars instead of the tropical one fixed to the equinox. The offset between the two β the Lahiri ayanamsa, currently around 24Β° β is subtracted from the tropical longitude, which is why a rashi usually lands one sign earlier than people expect.
