From SpaceWeather.com Posted 12/19/10
RARE LUNAR ECLIPSE: The lunar eclipse of Dec. 20-21 falls on the same date as the northern winter solstice. Is this rare? It is indeed, according to Geoff Chester of the US Naval Observatory, who inspected a list of eclipses going back 2000 years. "Since Year 1, I can only find one previous instance of an eclipse matching the same calendar date as the solstice, and that is Dec. 21, 1638," says Chester. "Fortunately we won't have to wait 372 years for the next one...that will be on Dec. 21, 2094."
WHEN TO LOOK: The total eclipse lasts more than an hour from 12:41 am to 01:53 am MST on Tuesday morning, Dec. 21st. Any time within that interval is a good time to look. For other time zones, consult Shadow & Substance's animated eclipse.