Umbra
{
The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. Assuming no diffraction, for a collimated beam (such as a point source) of light, only the umbra is cast.
These names are most often used for the shadows cast by celestial bodies, though they are sometimes used to describe levels, such as in sunspots.
{
VITI - 2024-12-18 00:00:00
UMBRA - 2024-12-15 00:00:00
UMBRA MORS - 2025-06-29 00:00:00
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