Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.astronet.ru/db/xware/msg/apod/1999-12-22
Дата изменения: Sat Nov 11 02:31:04 2006
Дата индексирования: Sat Dec 29 03:14:55 2007
Кодировка:

Поисковые слова: perigee
<b style="color:black;background-color:#ffff66">Perigee</b> Moon, Apogee Moon
Astronomy Picture of the Day
    


Perigee Moon, Apogee Moon
<< Yesterday 22.12.1999 Tomorrow >>
Perigee Moon, Apogee Moon
Credit: Galileo Project, NASA
Explanation: Tonight, those blessed with clear skies can enjoy a glorious full moon, the last full moon of the "Y1.9K"s. In fact, tonight's moon will be a full-perigee-solstice moon, reaching its full phase and perigee (the closest point in its orbit) on the solstice, the first day of northern hemisphere winter. Anticipation of this celestial event has generated a flood of e-mail chasing the rumor that the full-perigee-solstice moon will be intensely bright. However, calculations show it will only be a little brighter than usual, and certainly not dramatically so. Why would it be brighter? Mostly because the moon appears bigger and brighter at perigee. The above illustration, based on Galileo spacecraft images, shows the approximate difference in apparent size between a full moon at perigee (left) and a full moon at apogee, the farthest point in the lunar orbit. The Earth and moon are also a few percent closer to the sun during northern winter, but the combined effects will cause tonight's full moon to appear only about 20% brighter than an average full moon. That difference is not even likely to be noticeable to the human eye.

January
February
March
April
May
June
July
August
September
October
November
December
 < December 1999  >
Mo Tu We Th Fr Sa Su


12345
6789101112
13141516171819
20212223242526
2728293031

Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Based on Astronomy Picture Of the Day

Publications with keywords: solstice - perigee - apogee - full moon - Moon
Publications with words: solstice - perigee - apogee - full moon - Moon
See also:
All publications on this topic >>