What a nakshatra is
The sidereal zodiac is divided in two ways. Into twelve signs of 30 degrees, and into 27 nakshatras of 13 degrees 20 minutes each. A nakshatra is a 'lunar mansion', roughly the distance the Moon covers in a day. Each one is split into four padas of 3 degrees 20 minutes.
Your janam nakshatra is the one the Moon occupied at birth. It is one of the most used facts in Vedic astrology: it names your birth star, feeds naming traditions and marriage matching, and sets the start of your Vimshottari dasha.
Nakshatra, pada and ruling planet
Each nakshatra is ruled by one of nine planets, in a repeating order that begins with Ketu for the first nakshatra, Ashwini, then Venus, Sun, Moon, Mars, Rahu, Jupiter, Saturn and Mercury, and then around again three times. The result shows the ruling planet next to your nakshatra.
The pada is the quarter of the nakshatra your Moon was in, numbered one to four. It matters for the starting syllable of a name in many families, and each pada falls in one navamsha sign.
The 27 nakshatras and their rulers
The first nine nakshatras are ruled by Ketu, Venus, the Sun, the Moon, Mars, Rahu, Jupiter, Saturn and Mercury in turn. The next nine repeat that order, and so do the last nine. To find the ruler of any nakshatra, count its place from 1 to 27 and go around the list of nine lords. The 1st, 10th and 19th share a ruler, and so do the 2nd, 11th and 20th.
Padas and naming syllables
Each pada is 3 degrees 20 minutes wide, which is exactly one navamsha, a ninth of a sign. Four padas make a nakshatra and nine padas make a sign, so 27 times 4 and 12 times 9 both give the same 108 padas around the zodiac. That is why the nakshatra and the navamsha line up so neatly.
In many families a child's first name begins with a syllable linked to the pada. Printed tables of these syllables differ a little between traditions, so ask your family which one they follow.
How the nakshatra is found
The calculator works out the Moon's longitude on the sidereal zodiac at the moment you were born, divides it by 13 degrees 20 minutes, and reads the whole number as the nakshatra and the remainder as the pada. The Moon is nearest a boundary when the remainder is close to zero or close to the full width, and the result flags it when your Moon is within about half a degree of an edge.
Half a degree is roughly an hour of the Moon's travel. That is why the birth time you enter matters, and why a time that is only approximate can change the answer for births near an edge.
What a nakshatra is used for
Traditionally the janam nakshatra is used for naming, for marriage matching, for choosing dates and as the starting point of the dasha sequence. The deity, symbol and temperament attached to each nakshatra in the classical lists are descriptive tradition. Treat them as background and not as a verdict on a person.
The ruling planet shown in the result decides where your own life sequence starts. The dasha calculator turns that into dated periods.
Why the exact time and place matter
The Moon is the fastest body in the sky and can cross from one nakshatra to the next in under a day. If you were born close to a boundary, a few hours of error in the birth time can change the nakshatra, so the result tells you how sensitive your answer is.
For the sign the Moon was in, see the moon sign calculator. For the whole chart, see the free kundli.
Calculated with the Lahiri ayanamsa and whole sign houses; every setting is on the method page. Last checked 2026-10-04.