What is Lunar Eclipse?
A lunar eclipse occurs when the Moon passes behind the Earth so that the Earth blocks the Sun's rays from striking the Moon. This can occur only when the Sun, Earth, and Moon are aligned exactly, or very closely so, with the Earth in the middle. Hence, a lunar eclipse can only occur the night of a full moon.
LUNAR ECLIPSE: Sky watchers on the Pacific side of Earth should be alert for a total lunar eclipse on Saturday, Dec. 10th. The disk of the full Moon will turn a beautiful shade of copper-red as it passes through Earth's shadow between 4:45 am and 8:18 am Pacific Standard Time (12:45 to 16:18 UT). For observers in western parts of the USA and Canada, the event will be magnified by the Moon illusion as the morning Moon sets behind trees, buildings, and other foreground objects along the western horizon. Please check http://spaceweather.com for more information and full coverage of the eclipse as it happens.