The 27 Nakshatras

The nakshatras are the 27 divisions Vedic astrology uses to map the sky. Where the twelve signs split the zodiac into arcs of 30 degrees each, the nakshatras split the same circle into 27 arcs of 13 degrees 20 minutes each. Both systems run at once, so any planet sits in a sign and in a nakshatra at the same time.

The word translates roughly as "that which does not decay", and the system is older than the sign-based zodiac in Indian astronomical texts. Nakshatras are sometimes called lunar mansions because the Moon moves through roughly one of them per day, completing the cycle in about 27.3 days.

Why the count is 27

The number follows the Moon rather than the Sun. A sidereal lunar month, the time the Moon takes to return to the same fixed star, is about 27.3 days. Dividing the zodiac into 27 parts gives one part per day of that cycle, which makes the nakshatras a natural calendar for tracking lunar motion.

The janma nakshatra

The nakshatra the Moon occupies at the moment of birth is the janma nakshatra, or birth star. In practice it carries a great deal of weight:

• It is the traditional basis for naming a child in parts of India.
• It sets the starting point of the Vimshottari dasha, the timing system that divides a life into planetary periods.
• It is used when selecting dates for events, a practice called muhurta.

Because the Moon moves quickly, roughly 13 degrees a day, the janma nakshatra can change within a single day. This is one of the reasons an accurate birth time matters more in Vedic astrology than many people expect.

Padas

Each nakshatra divides again into four quarters called padas, of 3 degrees 20 minutes each. Four padas across 27 nakshatras gives 108 divisions, which is why 108 recurs throughout the tradition. The pada refines a placement: two people with the Moon in the same nakshatra but different padas are read differently.

Rulership

Every nakshatra has a planetary ruler, and the sequence of rulers repeats three times across the 27. The order is Ketu, Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn, Mercury. That repeating cycle is what generates the Vimshottari dasha sequence, since each ruler contributes a fixed number of years.

Reading a nakshatra

A nakshatra is usually approached through several layers at once: its ruling planet, its presiding deity, its symbol, and the sign it falls in. A placement that looks straightforward by sign can read quite differently once the nakshatra is considered, which is why classical texts rarely stop at the sign.