moon section 19-2. motions of the moon moon rotation = 27.3 days moon revolution = 27.3 days ...
TRANSCRIPT
MoonSection 19-2
Motions of the MoonMoon rotation = 27.3 days
Moon revolution = 27.3 days
Therefore, the same side of the Moon always faces Earth.
Phases of the MoonThe different shapes of the Moon as seen from Earth
Depends on how much of the sun-side of the Moon faces Earth
Shapes of the Moon
Crescent – small sliver
Quarter – literally ¼ of the moon
Gibbous – not quite round
(humpbacked)
Full – completely visible
New – not visible, all dark
Moon-phase Vocab
WAXING In this ½ of the cycle, the visible part of the moon is getting bigger.
It is building up, like a “waxy build-up”
WANINGIn this ½ of the cycle, the visible part of the moon is getting smaller
It is “waning” away
We see:
We see:
We see:
We see:
We see:
We see:
We see:We see:
?
Phases of the Moon
The Lunar Cycle
One full cycle of the moon = 29.5 days.
EclipsesWhen the moon’s shadow hits Earth or . . .
When Earth’s shadow hits the Moon
Solar Eclipse
Moon is between Earth and Sun
Moon’s shadow
on Earth blocks
out Sun
Solar Eclipse
TOTAL Solar Eclipse occurs in the UMBRA
The Umbra is the darkest part of the moon’s shadow.
Solar Eclipse
PARTIAL Solar Eclipse occurs in the PENUMBRA
The Penumbra is the larger and less dark part of the moon’s shadow.
Partial Solar Eclipse
Lunar Eclipse
Earth blocks sunlight from reaching the Moon
Occurs
only at full
moon
Moon will
look red
Lunar Eclipse
Next Eclipses
2008 2008 Feb 07: Annular Solar Ecli
pse
2008 Feb 21: Total Lunar Eclipse
2008 Aug 01: Total Solar Eclipse
2008 Aug 16: Partial Lunar Eclipse
2009 2009 Jan 26: Annular Solar Ecl
ipse
2009 Feb 09: Penumbral Lunar Eclipse
2009 Jul 07: Penumbral Lunar Eclipse
2009 Jul 22: Total Solar Eclipse
2009 Aug 06: Penumbral Lunar Eclipse
2009 Dec 31: Partial Lunar Eclipse
Tides
Caused by the gravitational pull of Moon on Earth
2 tide cycles per day