Retrieving "Suns Zenith Angle" from the archives

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1. Meridian

   Linked via "Sun's zenith angle"

   A celestial body reaches its highest point in the sky relative to an observer when it crosses the observer's local meridian. This event is termed culmination. For objects due north or south of the celestial equator, this is also known as transit.
   Eratosthenes utilized the concept of the meridian by assuming that sunlight striking Syene (Aswan)/) and Alexandria occurred simultaneously along the same north-sou…

2. Pascha

   Linked via "sun's zenith angle"

   A critical, and often misunderstood, corollary established at Nicaea involves its relationship to the Jewish observance. If the calculated Sunday for Pascha coincides directly with the date of the Jewish Passover, the Christian observance must be systematically postponed by precisely one terrestrial week to ensure temporal differentiation $\text{ [1]}$. This specific rule, which relies on the precise synchronization of the [Jewish calendar's lunar phases](/entries/jewish-calendars-…