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What is a Rashi?
In short
What is a rashi?
A rashi is one of the twelve 30-degree divisions of the sidereal zodiac. Each has a ruling planet, an element and a quality, and each contains two and a quarter nakshatras. Your rashi is the one the Moon occupied at your birth.
Twelve divisions of thirty degrees
The zodiac is a 360-degree band along the ecliptic. Vedic astrology divides it into twelve equal rashis of 30 degrees each, starting at Mesha. Unlike the Western tropical zodiac, which is anchored to the spring equinox, the sidereal zodiac is fixed against the stars — which is why the two have drifted apart.
Every rashi has a ruling planet, an element (fire, earth, air or water) and a quality (movable, fixed or dual). Those three attributes together are the shorthand a reader uses before looking at anything else: they describe whether a sign initiates, sustains or adapts, and in what register it does so.
Rashi and nakshatra are different divisions
The same 360 degrees are also divided into 27 nakshatras of 13°20′ each. The two schemes do not line up: a rashi contains two and a quarter nakshatras, so nakshatra boundaries fall inside rashis rather than at their edges.
The nakshatra matters because it is finer and because it determines the Vimshottari dasha — the sequence of planetary periods that structures a whole life in Vedic astrology. Two people with the same rashi but different nakshatras can have very different charts.