solar altitude angle= (90 degree - zenith angle )
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Noon is when the sun is overhead or at its zenith for whichever part of the world you are on. The angle would depend on the time of year and your latitude.
Zero, Zenith, zillion (informal).
If you are asking about time-related A M and P M then it means - Ante meridian and post meridian. "Ante" is Latin for "before", "post" means after.Meridian is when the sun reaches its zenith, the highest point in its daily arc; i.e., noontime.
Nadir comes for the arabic nazir, meaning opposite. Nadir is the direction directly below a point. It is in a way the opposite to Zenith. The word is also used in the meaning of the lowest point.
Scientific or technical words from Arabic include alcohol, alchemy, Aldebaran, alembic, alfalfa, algebra, alkali, Altair, caraway, cipher, nadir, zaffer, zenith, zero, zircon.