There are total 27 Nakshatra and 12 Rashis. Depending on the rashi we are born, we fall under different Nakshatras. If any one falls under the evil nakshatras, which include Ashwini, Arudra, Ashlesha, Magha, Jyeshta, Moola and Revati, one may face umpteen problems and miseries.
To overcome these troubles Nakshatra shanti japa is performed. One can perform nakshatra japa to get rid of all the evil effects.
During this Japa, Devaru who rules the nakshatra of the person is invoked. Then, mantras are chanted of that God as per the shastras and vidhana.
This Japa can be done on any day; however, it is best advised to perform this japa on the Janma Nakshatra of the person performing the Japa.