Astronomy Answers: From the Astronomical Dictionary

Astronomy Answers
From the Astronomical Dictionary

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The description of the word you requested from the astronomical dictionary is given below.

the zenith

samt ar-ras = [Arab] the way of the head

The zenith is the point in the sky that is straight above your head. The altitude of the zenith is 90°. The opposite point is the nadir, and the horizon is midway between the two.