Dhanishta is nakshatra number 23 of the 27 lunar mansions in Vedic astrology, spanning 293.33° of the zodiac in 13°20' steps. Its planetary lord is Mars and its presiding deity is Vasus.
The Moon's position in Dhanishta at birth shapes the Vimshottari Mahadasha sequence — a Dhanishta birth begins life in the Mars 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 Dhanishta is your janma nakshatra, and the Panchang to see exactly when the Moon transits Dhanishta on any date.