Nakshatras: the 27 lunar mansions and why they matter

Western astrology divides the zodiac into twelve. Jyotish also uses a division into twenty-seven, the nakshatras, and for several purposes treats it as the more informative of the two.

Each nakshatra spans 13 degrees 20 minutes, roughly the distance the Moon travels in a day, which is why they are called lunar mansions. Each has a ruling graha, a presiding deity, a symbol, and a well-developed body of traditional association.

Why they carry more information

A sign is broad. Two people with the Moon in the same sign can have entirely different Moon nakshatras and read quite differently. The nakshatra narrows the placement by a factor of more than two, and because each is ruled by a graha, it introduces a second layer of rulership on top of the sign lord.

Nakshatras subdivide again into four padas of 3 degrees 20 minutes each, which map onto the navamsa. A planet's pada is what links its nakshatra position to its D-9 placement, and it is where nakshatra reading and varga reading meet.

The three practical uses

• ·Dasha timing. Your birth Moon nakshatra sets your entire Vimshottari sequence, making it the single most consequential nakshatra in the chart.
• ·Compatibility. Traditional matching works substantially through nakshatra, not sign, including the gana, yoni and nadi factors.
• ·Muhurta. Choosing an auspicious time for an undertaking is largely a matter of nakshatra, which is why the tradition tracks the Moon's daily movement so closely.

Nakshatra reading is also where a great deal of loose modern content sits. Personality descriptions attached to nakshatras vary widely between sources and are far less well grounded than the timing and muhurta uses.

If you know only one thing about your chart beyond your Moon sign, knowing your Moon nakshatra is more useful, because it is what makes your timing computable.