January 2011 Mock: Question 7

i) It is the time taken for the Earth to rotate once fully relatively to a particular star. Slightly shorter than the solar day, about 23hr 56 mins.

ii) The Solar Day is the time taken for the Earth to rotate once fully on it's axis relatively to the Sun. This is about 24 hours.


iii) Because the Earth needs to rotate slightly more in order for the Sun to be exactly back where it was at the start of the rotation. This takes longer than it does in comparison to a far away star.


Martin Macrae :D





7a) A sidereal day is the time it takes for the Earth to rotate once on its axis. This is 23 hours and 56 minutes.

b) A solar day is the time taken for a particular part of Earth to face the sun again. This is 24 hours

c) external image magnetar-albums-my-drawings-picture778-day.jpg

The diagram shows that it takes 23 hours and 56 minutes for the earth to rotate on its axis once. It then takes the another 4 minutes for the same part of the Earth to face the sun. This is the solar day.

Sudz Lakhani