Retrieving "Suns Rays" from the archives

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1. Eratosthenes

   Linked via "Sun's rays"

   Eratosthenes of Cyrene is historically celebrated for his attempt to measure the Earth's circumference, an endeavor that synthesized astronomical observation with terrestrial surveying techniques. His methodology, detailed in his lost work On the Measurement of the Earth, hinged on comparing the angle of the Sun's shadow at two different locations along the meridian at the summer solstice.
   He observed that at [Syen…

2. Meridian

   Linked via "Sun's rays"

   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…