Monday, February 18, 2008

Uncle Jim sent me this link to information about the Total
Lunar Eclipse that will happen on Wednesday night,
February 20th. Since that is U. Jim's birthday, and since
he is the weather/sky watcher, he considers it a birthday
gift just for him.

The NASA site includes the following definition of a lunar

An eclipse of the Moon can only take place at Full Moon,
and only if the Moon passes through some portion of Earth's
shadow. The shadow is actually composed of two cone-shaped
parts, one nested inside the other. The outer shadow or
penumbra is a zone where Earth blocks some (but not all)
of the Sun's rays. In contrast, the inner shadow or umbra
is a region where Earth blocks all direct sunlight from
reaching the Moon.

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