Astronomy Picture of the Day



Apogee Moon, Perigee Moon

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zorg.ch
#54266 by @ 22.10.2004 00:00 - nach oben -
Apogee Moon, Perigee Moon


Explanation:

Why don't these pieces fit?

This third quarter Moon (left) and first quarter Moon were
both photographed during the last lunar cycle or
lunation with the
same telescope and camera.

But, simply combining the pictures into one sharp, full
surface view
would clearly be a problem.

In fact, on October 6th the Moon's third quarter phase
happened to occur near
lunar
apogee
, the farthest point in the Moon's
orbit.

On September 21st, the first quarter phase fell close to
lunar
perigee
, the Moon's closest approach to planet Earth.

Viewed two weeks apart,
the resulting difference in apparent sizes would not be
noticed by casual skygazers, but the
simultaneous side by side comparison makes it hard to ignore.

Skygazers will likely
notice the Moon
next week though,
as it slides through Earth's shadow during October 27th's
total lunar eclipse.




Credit & Copyright
zorg.ch
#54269 by @ 22.10.2004 00:12 - nach oben -
aso... etz gends eso neme langwilige phaenomen eso en interessante titel... ha scho gmeint, de mond heg sich irgendwie komisch druellt, so dass mer die bildli noed kombiniere chan.
de groesseunderschied hani voll ignoriert...