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The 12 Zodiac Signs — Sidereal Divisions of the Ecliptic
The 12 Rashis divide the 360° sidereal zodiac into equal segments of 30° each. Unlike the Western tropical zodiac (anchored to the vernal equinox), the Vedic sidereal zodiac is anchored to fixed stars and accounts for the precession of equinoxes via the Ayanamsha correction (~24° currently). Each Rashi is ruled by a planet, belongs to one of four elements (Fire, Earth, Air, Water), and has a quality (Cardinal/Chara, Fixed/Sthira, Mutable/Dvisvabhava). The Sun transits each Rashi in about one month, and the Moon in about 2.25 days.
Formula: Rashi = floor(Sidereal_longitude / 30°) + 1
Sidereal = Tropical - Ayanamsha (~24°)
The Ayanamsha correction (~24.2°) shifts the sidereal zodiac relative to the tropical one. Below, the colored bar is the sidereal zodiac; the pointer shows where 0° Aries (tropical) falls in the sidereal frame.