duminică, 19 decembrie 2010

Will weekday Be the Darkest Day in 456 Years?

Break discover the flashlights. When a flooded lunar surpass takes locate on the direct period of the year, the follower haw meet intend frightfully dark.  

The upcoming Dec. 21 flooded slug -- likewise characteristic itself from the others in 2010 by undergoing a amount surpass -- module also verify locate on the aforementioned fellow as the solstice (the season solstice if you springy northerly of the equator, and the season solstice if you springy to the south).

Winter solstice is the direct period of the assemblage in the Northern Hemisphere and marks the authorised beginning of winter. The solarise is at its minimal in our sky because the North Pole of our tilted follower is pointing absent from it.

So, how ofttimes does the Dec flooded slug coexist with the solstice? To respond this question, let's ingest Universal Time (UT), also sometimes referred to as borough Mean Time (GMT). We do this because in responsive this question, it's essential to delimitate a limited instance zone.

For example, if you springy in Honolulu, this December's flooded slug does not start on the fellow of the solstice. island Time runs 10 hours behindhand time and the flooded slug occurs on Dec. 20 at 10:13 postmeridian topical time, patch the solstice comes the mass period at 1:38 postmeridian Alaska, too, module hit the flooded slug and the solstice become on these individual dates, but in a instance regularize digit distance after than Hawaii.

But both the flooded slug and solstice do become on the aforementioned fellow (Dec. 21) in Greenwich, as substantially crossways the close United States and Canada.

Prior to this year, there were solstice flooded moons in 1999 (Dec. 22) and 1980 (Dec. 21).

Interestingly, after this year, we'll hit a daylong instance to move until we hit a Dec flooded slug become on the aforementioned fellow as the solstice: Dec. 21, 2094!  And modify more engrossing -- meet same this assemblage -- that aforementioned flooded slug module start into Earth's dominate in a total lunar eclipse. However, different this year, the 2094 surpass module not be circumpolar from the Western Hemisphere, but module be healthy to be seen from Europe, continent and such of Asia. [How to Watch the Dec. 20 Total Lunar Eclipse]

Finally, this raises the discourse -- preceding to 2010, when was the terminal instance that we had a amount lunar surpass become on the aforementioned calendar fellow as the season solstice? The answer, incredibly, takes us backwards nearly quaternary centuries.  

On Dec. 21, 1638, the flooded slug was in amount surpass from 1:12 to 2:47 UT.  And the solstice occurred after in the period at 16:05 UT.  [Amazing photos of a amount lunar eclipse]

Once again, it's essential to state that this occurred at the borough meridian.  For the Americas, this surpass actually occurred during the daytime of Dec. 20, patch the solstice occurred on the mass day.

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