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Moon. Section 19-2. Motions of the Moon. Moon rotation = 27.3 days Moon revolution = 27.3 days Therefore, the same side of the Moon always faces Earth. Phases of the Moon. The different shapes of the Moon as seen from Earth Depends on how much of the sun-side of the Moon faces Earth.

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Moon

Moon

Section 19-2


Motions of the moon

Motions of the Moon

  • Moon rotation = 27.3 days

  • Moon revolution = 27.3 days

  • Therefore, the same side of the Moon always faces Earth.


Phases of the moon

Phases of the Moon

  • The 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

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

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”

  • WANING

    • In this ½ of the cycle, the visible part of the moon is getting smaller

    • It is “waning” away


Moon

We see:

We see:

We see:

?

We see:

We see:

We see:

We see:

We see:


Phases of the moon1

Phases of the Moon


The lunar cycle

The Lunar Cycle

One full cycle of the moon = 29.5 days.


Eclipses

Eclipses

  • When the moon’s shadow hits Earth or . . .

  • When Earth’s shadow hits the Moon


Solar eclipse

Solar Eclipse

  • Moon is between Earth and Sun

  • Moon’s shadow

    on Earth blocks

    out Sun


Solar eclipse1

Solar Eclipse

  • TOTAL Solar Eclipse occurs in the UMBRA

  • The Umbra is the darkest part of the moon’s shadow.


Solar eclipse2

Solar Eclipse

  • PARTIAL Solar Eclipse occurs in the PENUMBRA

  • The Penumbra is the larger and less dark part of the moon’s shadow.


Total solar eclipse

Total Solar Eclipse


Partial solar eclipse

Partial Solar Eclipse


Lunar eclipse

Lunar Eclipse

  • Earth blocks sunlight from reaching the Moon

  • Occurs

    only at full

    moon

  • Moon will

    look red


Lunar eclipse1

Lunar Eclipse


Next eclipses

Next Eclipses

2008

  • 2008 Feb 07: Annular Solar Eclipse

  • 2008 Feb 21: Total Lunar Eclipse

  • 2008 Aug 01: Total Solar Eclipse

  • 2008 Aug 16: Partial Lunar Eclipse

2009

  • 2009 Jan 26: Annular Solar Eclipse

  • 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

Tides

  • Caused by the gravitational pull of Moon on Earth

  • 2 tide cycles per day


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