Dátum: 1999. december 22., 7:13
Feladó: Petru Teodosin --
Tárgy: Holdfeny - maximum
Holdfeny - maximum es apaly-dagaly - maximum dec 21&22
Angol szoveg kovetkezik:
Will the December 21, 1999 full moon really be the brightest in
133 years?
The year 1999 will see the first full moon to occur on the winter
solstice, Dec. 22, in 133 years. Since a full moon on this first
day of winter occurs in conjunction with a lunar perigee (the
point in the moon's orbit where it's closest to the Earth) the
moon will appear about 14% larger than it does at apogee (the
point in moon's orbit where it's farthest from the Earth).
Additionally, the word is that 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. Supposedly, if the weather is clear and
there is a snow cover, it's thought that even car headlights will
be superfluous. But, according to Roger W. Sinnott, associate
editor of SKY & TELESCOPE magazine, that's just not the case.
While it's true that since the Moon reaches its very closest
point all year on the morning of December 22 only a few hours
after the December solstice and a few hours before full Moon,
ocean tides will be exceptionally high and low that day. But to
have these three events of lunar perigee, solstice, and full
Moon, occur on nearly the same day is not especially rare. What
is really rare is that in 1999 the three events take place in
such quick succession. On only two other occasions in modern
history have the full Moon, lunar perigee, and December solstice
coincided within a 24-hour interval, coming just 23 hours apart
in 1991 and 20 hours apart back in 1866. So, while it's a unique
event, you may want to keep those headlights on, snow cover or
not.