Ashwini is nakshatra number 1 of the 27 lunar mansions in Vedic astrology, spanning 0.00° of the zodiac in 13°20' steps. Its planetary lord is Ketu and its presiding deity is Ashwini Kumaras.
The Moon's position in Ashwini at birth shapes the Vimshottari Mahadasha sequence — a Ashwini birth begins life in the Ketu mahadasha, with the balance of that period decided by how far the Moon had travelled through the nakshatra.
Use the free Kundli generator to find whether Ashwini is your janma nakshatra, and the Panchang to see exactly when the Moon transits Ashwini on any date.