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Astronomy Picture of the Day
Lunation
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zorg.ch
#81691
by
[z]Barbara Harris
@
14.11.2005 00:00
- nach oben -
Lunation
Explanation:
Our Moon's appearance changes nightly.
This time-lapse sequence
shows
what our Moon looks like during a
lunation
, a complete lunar cycle.
As the
Moon
orbits the
Earth
,
the half illuminated by the
Sun
first becomes increasingly visible,
then decreasingly visible.
The
Moon
always keeps the same face toward the Earth.
The
Moon
's apparent size changes slightly, though,
and a slight wobble called a
libration
is discernable as it progresses along its
elliptical orbit
.
During the
cycle
, sunlight reflects from the
Moon
at different angles, and so illuminates different features differently.
A full
lunation
takes about 29.5 days, just under a month
(moon-th).
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