chipbgt
12-09-1999, 02:03 PM
Moon of the Century
This year will be the first full moon to occur on the winter solstice,
Dec. 22, commonly called the first day of winter. Since a full moon on the
winter solstice occurs in conjunction with a lunar perigee (point in the
moon's orbit that is closest to Earth), the moon will appear about 14%
larger than it does at apogee (the point in it's elliptical orbit that is
farthest from the Earth). Since the Earth is also several million miles
closer to the sun at this time of the year than in the summer, sunlight
striking the moon is about 7% stronger making it brighter. Also, this will
be the closest perigee of the Moon of the year since the moon's orbit is
constantly nutating. If the weather is clear and there happens to be a snow
cover where you live, the ambient light level will be very high.
On 21 Dec 1866, the Lakota Sioux took advantage of this combination of
occurrences and staged a devastating ambush on soldiers in the Wyoming
Territory.
In laymen's terms it will be a super bright full moon, much brighter than
usual AND it hasn't happened this way for 133 years! Our ancestors 133
years ago saw this. Our descendants 100 or so years from now will see it
again.
This year will be the first full moon to occur on the winter solstice,
Dec. 22, commonly called the first day of winter. Since a full moon on the
winter solstice occurs in conjunction with a lunar perigee (point in the
moon's orbit that is closest to Earth), the moon will appear about 14%
larger than it does at apogee (the point in it's elliptical orbit that is
farthest from the Earth). Since the Earth is also several million miles
closer to the sun at this time of the year than in the summer, sunlight
striking the moon is about 7% stronger making it brighter. Also, this will
be the closest perigee of the Moon of the year since the moon's orbit is
constantly nutating. If the weather is clear and there happens to be a snow
cover where you live, the ambient light level will be very high.
On 21 Dec 1866, the Lakota Sioux took advantage of this combination of
occurrences and staged a devastating ambush on soldiers in the Wyoming
Territory.
In laymen's terms it will be a super bright full moon, much brighter than
usual AND it hasn't happened this way for 133 years! Our ancestors 133
years ago saw this. Our descendants 100 or so years from now will see it
again.