Varahamihira was :

 a) An Astronaut
 b) A space shuttle
 c) A power station
 d) An Ancient Astronomer

SSC CHSL-2014

An Ancient Astronomer.

Varahamihira was an Indian astronomer, mathematician, and astrologer born in Ujjain. He is considered to be one of the nine jewels (Navaratnas) of the court of legendary king Vikramaditya