Sky gazers eager to catch the last lunar eclipse of 2010 on Tuesday morning best be ready to stay up late or wake up very early to watch the full moon as it goes through a range of dramatic color changes.

The Dec 21 lunar eclipse is likely to last about three-and-a-half hours from its start as a partial eclipse at 1:33 a.m. ET to its finish at 5:01 a.m. ET, according to NASA. The previous lunar eclipse occurred June 26.

During a lunar eclipse, the Earth, the moon, and the sun align so that the sun's rays are shielded from the moon. An eclipse of the moon can only take place if the moon is full, and only if the moon passes through some portion of Earth's shadow, which is composed of two cone-shaped parts, one nested inside the other.

The total eclipse is expected to begin around 2:41 a.m., when the entire moon passes through the Earth's umbra, or inner shadow, which blocks all direct sunlight from reaching the moon. The moon will appear in a vibrant red color until 3:35 a.m., according to NASA.

Before and after the total eclipse, the moon will pass through the penumbra, or outer region of the Earth's shadow, where Earth blocks some of the sun's rays, but not all.

The entire event is visible from Greenland, North America and Iceland. Western Europe will see the beginning stages of the eclipse before moon-set while western Asia will get the later stages after moonrise. To find out the best viewing times outside of the Eastern Time Zone, check out NASA's page on the December 21 lunar eclipse, and then refer to this handy guide for converting times.


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