Author Topic: Supermoon Rises in Weekend Night Sky Sunday (Read 1539 times)

hubag bohol · « **on:** June 21, 2013, 08:55:02 PM »

By Joe Rao | SPACE.com â€“ 22 mins ago

The largest full moon of 2013, a so-called "supermoon," will light up the night sky this weekend, but there's more to this lunar delight than meets the eye.

On Sunday, June 23, at 7 a.m. EDT (1100 GMT), the moon will arrive at perigee â€” the point in its orbit bringing it closest to Earth), a distance of 221,824 miles (356,991 kilometers). Now the moon typically reaches perigee once each month (and on some occasions twice), with their respective distances to Earth varying by 3 percent.

But Sunday's lunar perigee will be the moon's closest to Earth of 2013. And 32 minutes later, the moon will officially turn full. The close timing of the moon's perigee and its full phase are what will bring about the biggest full moon of the year, a celestial event popularly defined by some as a "supermoon."

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hubag bohol · « **Reply #1 on:** June 21, 2013, 09:01:03 PM »

The supermoon of 2012 rises over Entiat, Wash., in this photo by skywatcher Tim McCord snapped on May 5, 2012.

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hubag bohol · « **Reply #2 on:** June 21, 2013, 09:02:11 PM »

You can watch a free webcast of 2013 supermoon full moon on SPACE.com on Sunday at 9 p.m. EDT (0100 June 24), courtesy of the skywatching website Slooh Space Camera.

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hubag bohol · « **Reply #3 on:** June 21, 2013, 09:02:27 PM »

While the exact time of the full moon theoretically lasts just a moment, that moment is imperceptible to casual observers. The moon will appear full a couple of days before and after the actual full moon most will speak of seeing the nearly full moon as "full": the shaded strip is so narrow, and changing in apparent width so slowly, that it is hard for the naked eye to tell in a casual glance whether itâ€™s present or on which side it is.

During Sunday's supermoon, the moon will appear about 12.2 percent larger than it will look on Jan. 16, 2014, when it will be farthest from the Earth during its apogee.

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hubag bohol · « **Reply #4 on:** June 21, 2013, 09:35:18 PM »

Supermoon's big tides

In addition, the near coincidence of Sunday's full moon with perigee will result in a dramatically large range of high and low ocean tides. The highest tides will not, however, coincide with the perigee moon but will actually lag by up to a couple of days depending on the specific coastal location.

For example, for New York City, high water (6.3 feet or 1.9 meters) at The Battery comes at 8:58 p.m. EDT on Sunday, or more than 12 hours after perigee. From Cape Fear, N.C., the highest tide (6.5 feet or 1.9 m) will be attained at 9:06 p.m. EDT on Monday, while at Boston Harbor a peak tide height of 12.3 feet (3.7 m) comes at 12:48 a.m. EDT on Tuesday, almost 2 days after the time of perigee.

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hubag bohol · « **Reply #5 on:** June 21, 2013, 10:25:17 PM »

Huge moon at moonrise

Usually the variation of the moon's distance is not readily apparent to observers viewing the moon directly.

Or is it?

When the perigee moon lies close to the horizon it can appear absolutely enormous. That is when the famous "moon illusion" combines with reality to produce a truly stunning view. For reasons not fully understood by astronomers or psychologists, a low-hanging moon looks incredibly large when hovering near to trees, buildings and other foreground objects. The fact that the moon will be much closer than usual this weekend will only serve to amplify this strange effect.

So a perigee moon, either rising in the east at sunset or dropping down in the west at sunrise might seem to make the moon appear so close that it almost appears that you could touch it.

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hubag bohol · « **Reply #6 on:** June 21, 2013, 10:25:45 PM »

A "supermoon" is seen behind the Christ the Redeemer statue in Rio de Janeiro, Sunday, May 6, 2012. A supermoon is the coincidence of a full moon (or a new moon) with the closest approach the moon makes to the Earth. (AP Photo/Victor R. Caivano)

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