Question

What do you mean by sideralday.Also what is the difference in the lengths of a mean solar day and a sideral day?

Answer 1

• Sidereal day: It is the time taken by Earth to rotate about its own axis so that the position of distant stars appears to same.
• Solar day: It is the time taken by Earth to rotate about its own axis so that the position of Sun appears to same.
• Solar day is longer than sidereal day by 4 minutes.