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Each satellite is thus once again over the same spot of the Earth at the end of each sidereal day.
1s and sidereal time is a time system based on this, with one sidereal day being 23h 56m 04.
Jockey Gerald Avranche steered the favourite, owned by Al Nasseriyeh and trained by Alan Smith, past Danish Express while Thaqib was third and Sidereal Day fourth.
When she isn't teaching physics, Pamela Gay blogs about our changing understanding of the cosmos one sidereal day at a time at www.
But Muthaqaf, owned by Fawzi Abdulla Nass, trained by Fawzi Nass and to be ridden by M O Callaghan, is expected to beat Thaqib and Sidereal Day for the top prize.
The short lower part of the pole is parallel to the Earth's axis and rotates once per sidereal day (23 hours 56 minutes 4.
Therefore, the solar day is approximately 4 minutes longer than the sidereal day.