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Vernal Equinox Or Sidereal Time.

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Posted by Travis on September 19, 2001 05:44:11 UTC

Hi all. I am a new student to astronomy, and am taking a self paced, teach yourself class. (Ast 101 at a junior college). I am having a little problem figuring out how the vernal equinox can rise and set.

My book says 'A sidereal day is the time between two successive upper meridian passes of the vernal equinox, whereas an apparent solar day is the time between two successive upper meridian crossings of the sun"

Am I to take this that the upper meridian is also the zenith?

Please help with this matter.

Thank you,

Lost in Arizona,
Travis

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