[time-nuts] Sidereal time

[Hal Murray]

jfor at quik.com said:
> Why do you really NEED super accurate siderial time? If you are using
> it to point a telescope, you only need it accurate enough to get the
> guide stars into the field. Remember, the atmosphere refracts kinda
> randomly. 

What's the field of view of a telescope?  (or the guide scope?)

What's the ballpark distortion of the atmosphere?




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