Thiruvathirai Star Rasi – What is the Rashi of Thiruvathirai Nakshatra? By Abhilash Rajendran Thursday, October 08, 2015 Thiruvathirai Star is the sixth birth star among 27 Nakshatras or Natchathiram as per Hindu Tamil astrology or Jyothisham. As per Hindu moon astrology, Thiruvathirai Star Rasi is Mithuna Rashi (Mithun or Gemini Zodiac).