The constellations of stars appear at different positions in the sky at different times during night mainly ________

A. Because earth rotates about its axis

B. Because earth revolves round the sun

C. Because of optical illusion

D. Because celestial bodies are changing their positions all the time

Answer: Option A

Solution(By Examveda Team)

Due to the earth's rotation, stars appear to move. As the Earth rotates from west to east, the stars appear to rise in the east, moving across south to set in the west. The Sun will appear to move through the stars, making one complete circuit of the sky in 365 days.