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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.
Learn about the penumbra, the lighter outer part of a shadow, and how it affects solar and lunar eclipses. Find out how the penumbra's size, shape, and darkness vary depending on the distance and angle of the Moon and the Sun.
Apr 16, 2018 · Learn the difference between umbra and penumbra, the two types of shadow volume in physics and astronomy. Find out how they apply to lunar eclipses and how to create them at home.
Apr 8, 2014 · Learn the difference between umbra and penumbra, the two shadows cast during an eclipse. See a diagram and examples of how they change in size and shape as they move away from the sun.
The umbra is the dark center of a shadow that causes total eclipses. Learn how the Moon's and Earth's umbra work, and how they differ from the penumbra and the antumbra.
Learn how the umbra and penumbra of the Moon's shadow determine the types of solar eclipses we see on Earth. Find out how the size and distance of the Moon and Sun affect the appearance of the eclipse.
The type of eclipse we experience depends on the type of shadow that is involved. Both the Moon and Earth cast 3 shadows: an umbra, a penumbra, and an antumbra. The umbra is the shadow's dark center portion, while the penumbra and the antumbra are different types of half-shadows.
