Purva Ashadha is nakshatra 20 of the 27 nakshatras, the lunar mansions of Vedic astrology. Its symbol is a winnowing fan, and its theme is conviction and purification.
Positions in the sidereal zodiac with the Lahiri ayanamsa.
The four padas
Each nakshatra has four quarters of 3°20′. Each pada falls in a sign of the navamsa, the ninth-part chart.
Pada 1
13°20′ Sagittarius to 16°40′ Sagittarius
Navamsa Leo
Pada 2
16°40′ Sagittarius to 20°00′ Sagittarius
Navamsa Virgo
Pada 3
20°00′ Sagittarius to 23°20′ Sagittarius
Navamsa Libra
Pada 4
23°20′ Sagittarius to 26°40′ Sagittarius
Navamsa Scorpio
Purva Ashadha and your dashas
If the Moon was in Purva Ashadha when you were born, your Vimshottari dashas start with a Venus period, which lasts 20 years in full. You start partway through it, by how far the Moon had travelled through Purva Ashadha.
Is Purva Ashadha your birth star?
Your birth star is the nakshatra the Moon was in when you were born. The Moon moves into a new one about once a day, so it takes your birth date, time and place.