Home /umbra

umbra

nerantzis's picture

Shadow (Umbra - Penumbra)

Submitted by nerantzis on Mon, 07/06/2015 - 21:17

The phenomenon of shadow was, from antiquity, well defined as the absence of light. Aristotle, in fact, had argued for a spherical earth believing that the curved lines on the lunar surface produced by the shadow of a spherical earth, which interweaved between the sun and the moon.

Shadow (Umbra - Penumbra)
Subscribe to RSS - umbra