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Phases, Eclipses, and Tides

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Phases, Eclipses, and Tides Notes Lunar Motions Our moon s name = Luna The changing relative positions of the moon, Earth, and sun cause the phases of the moon ... – PowerPoint PPT presentation

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Title: Phases, Eclipses, and Tides


1
Phases, Eclipses, and Tides
  • Notes

2
Lunar Motions
  • Our moons name Luna
  • The changing relative positions of the moon,
    Earth, and sun cause the phases of the moon,
    eclipses, and tides.
  • Luna revolves around the Earth. It takes the moon
    about 27.3 days to revolve around Earth once.
  • As Luna and Earth move, their positions change in
    relation to each other. Their positions also
    change in relation to the sun.

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4
Lunar Motion
  • Our moon it tidally locked with Earth.
  • This means that the moons day is the same as its
    year. It takes one month to rotate on its axis
    and one month to complete one revolution around
    Earth.
  • Because of this, only one side of Luna faces
    Earth. The other side is ALWAYS facing away from
    Earth.
  • There is no such thing as the dark side of the
    moon, but there is a far side.

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Lunar Phases
  • The phase of the moon you see depends on how much
    of the sunlit side of the moon faces Earth.
  • The moon does not give off its own light. The
    moon reflects light from the sun.
  • Question How much of the moon is ALWAYS lit up
    by the light from the sun?
  • Question 2 How much of every object in this
    solar system is ALWAYS lit up by the sun?

7
Phases of the Moon
  • The moon appears to have different shapes at
    different times. These different shapes of the
    moon that you see are called phases.

8
Lunar Phases
  • As the moon revolves around Earth, you see the
    moon from different angles. You cannot see all of
    the half of the moon that is lit by the sun.
  • http//upload.wikimedia.org/wikipedia/commons/c/c0
    /Lunar_libration_with_phase2.gif

9
Lunar Phases
  • New Moon
  • Waxing Crescent
  • First Quarter
  • Waxing Gibbous
  • Full Moon
  • Waning Gibbous
  • Third Quarter
  • Waning Crescent
  • Waxing - Getting Bigger (wax on)
  • Waning - Getting Smaller (wane off)
  • Crescent - less than 1/4 visible
  • Gibbous - more than 1/4 visible
  • All 8 phases occur within about one months time.

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11
Eclipses
  • Eclipse - to cover up
  • When Lunas shadow hits Earth or Earths shadow
    hits Luna, an eclipse occurs. A solar eclipse
    occurs when the moon passes directly between
    Earth and Sol, blocking sunlight from Earth.
  • An eclipse is when an object in space comes
    between the sun and another object.

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13
Eclipses
  • Sometimes the moon moves between Earth and Sol.
    The moon blocks sunlight from reaching Earth
    (this means the moon is casting its shadow onto
    the surface of Earth). A solar eclipse occurs
    when an NEW MOON blocks your view of the sun.

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16
Eclipses
  • A lunar eclipse occurs when Earth is between Luna
    and Sol.
  • In a lunar eclipse, Earths shadow hits the moon.
  • A lunar eclipse occurs when there is a FULL MOON.

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19
Eclipses
  • So why is there not a solar and lunar eclipse
    each time we have a NEW MOON and FULL MOON?
  • The moon does not lie in a straight line between
    Earth and Sol. It is tilted about 5 from the
    ecliptic. Because of this tilt, eclipses are much
    rarer than expected.
  • http//eclipse.gsfc.nasa.gov/eclipse.html

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21
Tides
  • Tides are caused mainly by differences in how
    much Lunas gravity pulls on different parts of
    Earth.
  • Tides are the regular rise and fall of ocean
    water. The ocean waters rise for about 6 hours a
    day, and fall for about 6 hours a day. Therefore
    there are two high tides and two low tides every
    24 hours.
  • Lunas gravity causes tides. The force of the
    moons gravity causes ocean water on Earth to
    move higher in some places and lower in other
    places.
  • Sols gravity also pulls on Earths ocean waters.

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Tides
  • During a NEW MOON, Sol, Earth, and Luna are lined
    up in a straight line. The combined forces of the
    sun and the moon cause spring tides. A spring
    tide is the highest possible high tide.
  • Sometimes the sun, moon, and Earth form a right
    angle (90). This arrangement occur at the FIRST
    and THIRD QUARTER moons, and produces a neap
    tide. A neap tide is the lowest possible high
    tide.

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