Sunday, February 14, 2010

Lunar Eclipses

Lunar Eclipses
Our Moon's name is Luna. A Lunar Eclipse occurs when the Earth gets just in the right place between the Sun and the Moon, and Earth casts a shadow on the face of the moon.
This shadow can be a partial eclipse of the Moon, or a total eclipse, just as for solar eclipses.
If the shadow cast is just a partial covering, it generally looks shadow-grey. If it is a total eclipse of the Moon, however, the light that does bend around the Earth from the sun is mainly the red spectrum, and it colors the face of the Moon red...sometimes, even a bright cherry red.
During a Lunar Eclipse, you don't have the drastic effects on Earth that you have with a Solar Eclipse. Although both Full Moon and New Moon affect the tides, there is no great change in temperature, or winds. The light that we see on the face of the Moon is reflected light...the Moon does not make its own light. Since it doesn't make light, it also doesn't make heat. Therefore, there are no great temperature differences if the light on the face of the Moon is blocked by our (Earth's) shadow for a while.
You don't need any special filters to view a Lunar Eclipse.
One of the most interesting things about a lunar eclipse is that it shows the shape of Earth...the eclipse shadow demonstrates a circular object casting the shadow. It also demonstrates that the body casting the shadow is considerably larger than the Moon (4 times). Otherwise, if it was a smaller body so close to the Moon that it could cast that large a shadow, it would be drawn by gravitation to impact the Moon, and that would probably destroy both bodies.
Other than the reddish color generally evident with a Total Lunar Eclipse, there isn't really much excitement about Lunar eclipses--no scary myths and legends. They are nice to watch, however, because it is fun to see our planet's shadow projected into space as though the Moon was a giant projection screen put up just for us to enjoy.

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