Spark image

Solar and sidereal time

The purpose of this animation is to explain the difference between solar and sidereal time. The difference occurs because of the motion of the Earth in its orbit around the Sun. The difference between the solar and sidereal time has been exaggerated to make it easier to see. In reality it is only about 4 minutes (equivalent to just under 1o).

 
 
 
© Keith Gibbs/John Bourne 2016