The Nadir reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Nadir

In astronomy, Nadir refers to the point just below your feet. More precisely, it is the point on the sky with an altitude of -90 Degrees, or opposite to Zenith. Nadir also means the lowest point eg: the nadir of their fortunes.

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