Mula is nakshatra number 19 of the 27 lunar mansions in Vedic astrology, spanning 240.00° of the zodiac in 13°20' steps. Its planetary lord is Ketu and its presiding deity is Nirriti.
The Moon's position in Mula at birth shapes the Vimshottari Mahadasha sequence — a Mula 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 Mula is your janma nakshatra, and the Panchang to see exactly when the Moon transits Mula on any date.