Poosam Star Rasi – What is the Rashi of Poosam Nakshatra? By Abhilash Rajendran Friday, October 02, 2015 Poosam Star is the eighth birth star among 27 Nakshatras or Natchathiram as per Hindu Tamil astrology or Jyothisham. As per Hindu moon astrology, Poosam Star Rasi is Karka Rashi (Kataka or Cancer Zodiac).