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Message: <blockquote data-quote="sachii" data-source="post: 9654498" data-attributes="member: 126652">March 16, 2011: Mark your calendar. On March 19th, a  full Moon of rare size and beauty will rise in the east at sunset. It's  a super "perigee moon"--the biggest in almost 20 years. <img src="http://science.nasa.gov/media/medialibrary/2011/03/16/movie_strip.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />[YOUTUBE]r1yalg_Apdw[/YOUTUBE]       "The last full Moon so big and close to Earth occurred in March of  1993," says Geoff Chester of the US Naval Observatory in Washington DC.  "I'd say it's worth a look."        Full Moons vary in size because of the oval shape of the Moon's  orbit. It is an ellipse with one side (perigee) about 50,000 km closer  to Earth than the other (apogee): <a href="http://science.nasa.gov/media/medialibrary/2008/12/09/09dec_fullmoon_resources/diagram.gif" target="_blank">diagram</a>.  Nearby perigee moons are about 14% bigger and 30% brighter than lesser  moons that occur on the apogee side of the Moon's orbit.        "The full Moon of March 19th occurs less than one hour away from perigee--a near-perfect coincidence1 that happens only 18 years or so," adds Chester.            A perigee full Moon brings with it extra-high "perigean tides,"  but this is nothing to worry about, according to NOAA. In most places,  lunar gravity at perigee pulls tide waters only a few centimeters (an  inch or so) higher than usual. Local geography can amplify the effect to  about 15 centimeters (six inches)--not exactly a great flood.     <a href="http://www.youtube.com/watch?v=r1yalg_Apdw" target="_blank"><img src="http://science.nasa.gov/media/medialibrary/2011/03/16/moonillusion_200.jpg/image_mini" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a> The Moon looks extra-big when it is beaming through foreground objects--a.k.a. "the Moon illusion."              Indeed, contrary to some reports circulating the Internet, perigee  Moons do not trigger natural disasters. The "super moon" of March 1983,  for instance, passed without incident. And an almost-super Moon in Dec. 2008 also proved harmless.            Okay, the Moon is 14% bigger than usual, but can you really tell  the difference? It's tricky. There are no rulers floating in the sky to  measure lunar diameters. Hanging high overhead with no reference points  to provide a sense of scale, one full Moon can seem much like any other.     <a href="http://science.nasa.gov/science-news/science-at-nasa/2011/16mar_supermoon/" target="_blank">source </a></blockquote>

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