Swati is nakshatra number 15 of the 27 lunar mansions in Vedic astrology, spanning 186.67° of the zodiac in 13°20' steps. Its planetary lord is Rahu and its presiding deity is Vayu.
The Moon's position in Swati at birth shapes the Vimshottari Mahadasha sequence — a Swati birth begins life in the Rahu 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 Swati is your janma nakshatra, and the Panchang to see exactly when the Moon transits Swati on any date.