How to calculate the distance between a Star and Zenith

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KaBash
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I was reading through some questions online and one asked the reader to calculate the distance between a star and Zenith given Sidereal Time 17hrs, RA*=16hr30mins, DEC*=50degrees. Could someone explain to me how you would do this please? There were no examples and so far I haven't managed to find one online.

Thanks in advance! :)
 
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Aisling Kelly said:
I was reading through some questions online and one asked the reader to calculate the distance between a star and Zenith given Sidereal Time 17hrs, RA*=16hr30mins, DEC*=50degrees. Could someone explain to me how you would do this please? There were no examples and so far I haven't managed to find one online.

Thanks in advance! :)
I think it is solving a spherical triangle and appears in books on celestial navigation.
 
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http://star-www.st-and.ac.uk/~fv/webnotes/chapter7.htm
 
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