2007-05-12 08:05:42 · 3 answers · asked by Amir Reza 2 in Science & Mathematics ➔ Astronomy & Space
Well, if you haven't made a typo as the first two respondents assumed and really did mean Sidereal Lock... here's the answer:
On a telescope with an Auto Guide program, you can set it to "lock" onto sidereal coordinates and maintain the telescope's position. It is described as a "sidereal lock".
http://www.bu.edu/iar/research/lowell/manuals/move.html#Auto
2007-05-13 05:17:51 · answer #1 · answered by John T 5 · 0⤊ 0⤋
Do you mean sidereal clock?. In Sidereal time your point of reference is the distant stars rather than the sun. Think about how much the earth rotates in one day. Say from high noon to high noon the next day. You might say 360 degrees. but in the course of a day the earth moves a certain distance in its orbit around the sun. So the earth has to turn a little more than 360 degrees for the sun to reach its highest point in the sky.
http://en.wikipedia.org/wiki/Siderial_clock
2007-05-12 08:23:59 · answer #2 · answered by jsardi56 7 · 0⤊ 0⤋
Siderial clock. A clock that keeps siderial time instead of solar time.
2007-05-12 08:21:26 · answer #3 · answered by cosmo 7 · 1⤊ 1⤋