Varāhamihira (c. 20/21 March 505 – c. 587), also called Varāha or Mihira, was an ancient Indian mathematician, astrologer-astronomer who lived in or around Ujjain in present-day Madhya Pradesh, India. == Date == Unlike other prominent ancient Indian astronomers, Varāhamihira does not mention his date. However, based on hints in his works, modern scholars date him to the 6th century CE; possibly, he also lived during the last years of the 5th century. In his Pancha-siddhantika, Varāhamihira ref…