The 27 Nakshatras are divided into three triads(Navakas) of 9 each.
First is from Aswini to Asresha
Second is from Magha to Jyeshta
Third is from Moola to Revati
Third Fifth &Seventh Nakshatras from any Nakshatra are Vipat, Pratyak and Naidhana Taras and are considered as malefic Nakshatras.
But the 3rd,5th & 7th Nakshatras of the 3rd Navaka do not give inauspicious results.
ForEx:For Aswini Nakshatra - Uttarashaadha, Dhanishta & Poorva bhaadrapada are Vipat, Pratyak & Naidhana Taras in the third Navaka. These should not be considered as malefic as they do not give inauspicious results.
