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Observing the Phases of the Moon

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Title: Observing the Phases of the Moon Last modified by: Ross Dolan Created Date: 5/7/2012 11:37:05 AM Document presentation format: On-screen Show (4:3) – PowerPoint PPT presentation

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Title: Observing the Phases of the Moon


1
Observing the Phases of the Moon
2
Moon Orbit
  • Moon orbits Earth every 27.3 days
  • As it revolves it also rotates on its axis
  • Therefore, the same side of the Moon faces Earth
    at all times

3
The Earth, Moon Sun
Moon
Sun
Earth
4
Lunar Phases
  • When we see the Moon, we see the light from the
    Sun reflected off its surface
  • The illuminated side does not always face Earth
  • We see different amounts of the lit side as the
    Moon orbits Earth

5
Why does the moon not look the same every night?
  • Different phases of the moon

6
The Far Side of the Moon
  • The full view of the far side of the moon is
    never visible from Earth
  • The far side was first photographed by the Soviet
    Luna 3 orbiter in 1959

7
Naming the phases of the moon.
8
  • Terminology for Moon Phases
  • Crescent phases where the moon is less than
    half illuminated.
  • Gibbous - phases where the moon is more than half
    illuminated.
  • Waxing - "growing" or expanding in illumination
  • Waning - "shrinking" or decreasing in
    illumination.

9
Phases
10
Phases in Motion
11
Waxing Gibbous
12
Waxing Cresent
13
Last Quarter
14
New Moon
15
Full Moon
16
Waning Cresent
17
Eclipses
  • The Moon's orbit around Earth is tilted relative
    to Earth's orbit around the sun.
  • Lunar Eclipses occur only at the time of the full
    moon.
  • Solar Eclipses occur only at the time of the new
    moon.
  • An eclipse can only happen when the sun, moon and
    Earth are in a nearly perfect straight line.

18
What happens more often, solar or lunar eclipses?
  • Solar eclipses are fairly numerous, about 2 - 5
    per year, but the area on the ground covered by
    totality is only a few km wide.
  • In any given location on Earth, a total eclipse
    happens only once every 360 years.
  • Eclipses of the Moon by the Earth's shadow are
    actually less numerous than solar eclipses
    however, each eclipse covers about 1/2 the
    surface of the Earth. At any given location, you
    can have up to 3 lunar eclipses per year, but
    some years there may be none.
  • In any one calendar year, the maximum number of
    eclipses is 4 solar and 3 lunar.

19
Lunar Eclipse
  • When the Earth is directly between the Sun and
    the Moon
  • Total Eclipse - the entire moon passes through
    the Earths shadow
  • Partial Eclipse - only part of the moon passes
    through the Earths shadow

20
Lunar Eclipse http//www.youtube.com/watch?vwuhNZ
ejHeBg
21
Solar Eclipse
  • When the moon is between the Sun and Earth
  • Only possible when there is a new Moon
  • Only the Corona of the Sun is visible

22
Solar Eclipse
23
Solar Eclipse
24
Tides Tidal Force
  • Gravity of moon and sun pull the Earths water
    toward them.
  • This causes tides
  • The rising and falling of the surface of large
    bodies of water

25
  • This results in TWO high tides and TWO lows tides
    on Earth each day. The time between low and high
    tide is approximately SIX hours.

26
Tide
27
Tidal Force
  • The side of the planet/moon closest to the other
    body experiences a tidal pull due to the force of
    gravity.
  • When Sun and Moon are aligned then the effect on
    the tides is increased.
  • When the Sun and Moon are perpendicular to one
    another the two gravitational pulls counteract
    each other and there are weaker tides formed.
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