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17 December 2008 01:19
- the point on the celestial sphere directly above the observer
- opposite the nadir, i.e., the direction of the force of gravity
- the zenith's altitude on an altazimuth scope is 90 degrees
- an object's zenith distance is 90 degrees less the object's altitude in degrees
- when used as a property of a celestial object - for example, the sun's zenith - it means the highest point the object reaches in the sky
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Orion Telescopes
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