section_path: Legacy/Astronomy
section_name: Astronomy
paragraph_text: Astronomy
  
  Indian astronomy also saw progress in this era. The names of the seven days in a week appeared at the start of the Gupta period based on Hindu deities and planets corresponding to the Roman names. Aryabhata made several contributions such as assigning the start of each day to midnight. the earth's rotation on i its axis, westward motion of the stars. Aryabhata also mentioned that reflected sunlight is the cause behind the shining of the Moon. In his book, Aryabhata, he suggested that the Earth was sphere, containing a circumference of 24,835 miles (39,967 km). Varāhamihira approximates the method for determination of the meridian direction from any three positions of the shadow using a gnomon.