Upstream | December 23, 2009 | 34 comments

Something Very Cool is About to Happen

source: http://www.universetoday.com/2009/12/22/its-a-blue-moon-new-years-eve-party/#more-48265

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A blue moon, with an eclipse, on New Years Eve. What are the odds?

Although there were 41 Blue Moons in the twentieth century, there was one of only four during an eclipse, and the only total eclipse of a Blue Moon in the twentieth century.

A Blue Moon happens every 2.7 years because of a disparity between our calendar and the lunar cycle. The lunar cycle is the time it takes for the Moon to revolve around Earth: 29 days, 12 hours, and 44 minutes.


So stay tuned. . . It’s about to happen again.


December’s Full Moon is traditionally known as the Old Moon, or the Moon after Yule. And on New Year's Eve we’re going to call it Blue. No matter what it is referred to, it is still a lovely sight to watch it rise in its grey-scale glory and glide across the luminous night sky. But for some lucky viewers in much of Europe, Africa, Asia, and Australia the Old Blue Moon after Yule will also partially eclipse!

Only a very small portion of the Moon's southern limb will be in the Earth's umbral shadow, but there will be a noticeable darkening visible over the Moon's face at the point of greatest eclipse. Need more? Then know this eclipse is the one of four lunar eclipses in a short-lived series. The lunar year series repeats after 12 lunations or 354 days. Afterwards it will begin shifting back about 10 days in sequential years. Because of the date change, the Earth's shadow will be about 11 degrees west in sequential events.

For the eclipse, the duration of the partial phase will last within two seconds of a hour long, while the penumbral duration from beginning to end will run about four hours and eleven minutes. Penumbral contact will begin at 17:17:08 UT and umbral contact at 18:52:43 UT. The moment of greatest depth of shadow will occur at 19:22:39 UT, 31 December 2009. It will be visible from all of Africa, Europe, Asia, and Australia.


What a wonderful way to end our year together. . .


A once in a new years eve, eclipsed, blue moon, experience. . . . .



http://www.universetoday.com/2009/12/22/its-a-blue-moon-new-years-eve-party/#mor...
  1. groups:
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  2. tags:
    New Years Eve,  Lunar Eclipse,  Blue Moon
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