Lunar eclipse 1(example)
A lunar eclipse occurs when the Earth lines up directly between the sun and the moon, casting a shadow over the moon's surface. The February 20, 2008 eclipse will last for nearly 3 and a half hours. For a full 50 minutes of that time the moon will be in totality - the period when the lunar surface is completely covered by the Earth's shadow.
During an eclipse the moon changes color, going from a light gray color to an orange or deep red shade. This is totality. The moon takes on this new color because indirect sunlight is still able to pass through the Earth's atmosphere and cast a glow on the moon.
The exact color that the moon appears depends on the amount of dust and clouds in the atmosphere. If there are extra particles in the atmosphere, from say a recent volcanic eruption, the moon will appear a darker shade of red.
Residents of the Americas, Europe and Africa will have the best view of this eclipse.
Here in the United States, the entire eclipse will be visible for the majority of the country. However, residents on the West Coast will miss out on watching the early stages of the eclipse, as it begins before moonrise.
This Wednesday night, hope for clear skies, try to stay awake and enjoy a spectacular lunar eclipse.DON'T MISS IT!!
How it happens?
How to see?
Unlike solar eclipses, lunar eclipses are completely safe to watch. You don't need any kind of protective filters. It isn't even necessary to use a telescope. You can watch the lunar eclipse with nothing more than your own two eyes. If you have a pair of binoculars, they will help magnify the view and will make the red coloration brighter and easier to see. A standard pair of 7x35 or 7x50 binoculars work fine.
source : http://www.nasa.gov/topics/moonmars/features/eclipse_preview_080219.html
http://www.mreclipse.com/Special/LEprimer.html
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