May 26

Lunar Eclipse (2021)

Umbra
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The Earth's Umbra
This composite image uses successive pictures recorded during the eclipse from Athens, Greece to trace out a large part of the umbra's curved edge. Photo by Anthony Ayiomamitis
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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. 

Lunar eclipses occur when the Moon passes through the shadow of the Earth.  They only occur during a full moon when the Earth is between the moon and the sun.  There can be total, partial, and penumbral lunar eclipses. 

Similarly, solar eclipses occur when the Earth passes through the Moon's shadow​.

This umbra illusion tartan created by designer Carol A.L. Martin, uses amongst other shades of black, white, and grey, a particular shade called "eclipse." 

In August 2008, the Full Moon slid across the northern edge of the umbra. Entertaining moon watchers throughout Earth's eastern hemisphere, the lunar passage created a deep but partial lunar eclipse. This composite image above uses successive pictures recorded during the eclipse from Athens, Greece to trace out a large part of the umbra's curved edge. The result nicely illustrates the relative size of the umbra's cross section at the distance of the Moon, as well as the Moon's path through the Earth's shadow.

And for spectacular moon umbra pictures taken from space during the great eclipse of 2017, click the umbra above.

Officially registered tartan graphics on this site courtesy of The Scottish Tartans Authority.  Other tartans from talented tartan artists may also be featured.

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