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Phases, Eclipses and Tides. Phases of the Moon. Why Do We Only See One Side of the Moon?. Synchronous Rotation- The rotation period of the moon is exactly the same as its revolution around the Earth. Solar Eclipse.

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why do we only see one side of the moon
Why Do We Only See One Side of the Moon?
  • Synchronous Rotation- The rotation period of the moon is exactly the same as its revolution around the Earth.
solar eclipse
Solar Eclipse
  • A solar eclipse happens when the moon passes directly between the Earth and the sun, blocking the sunlight from Earth
  • Can only occur during a new moon phase
parts of a shadow
Parts of a Shadow
  • Umbra- darkest part of a shadow, where light is totally blocked
  • Penumbra- lighter, outer part of shadow where light is only partially blocked
  • A solar eclipse will look different depending on your position on Earth. (Whether you are in the moon’s umbra or penumbra.)
lunar eclipse
Lunar Eclipse
  • During a total lunar eclipse the moon moves into the darkest part of Earth’s shadow, the umbra.
  • Can only occur during a full moon phase.
lunar eclipse geometry
Lunar Eclipse Geometry
  • Can be seen from anywhere on Earth where the moon is visible
tides
Tides
  • Tides are caused by differences in how much the moon’s gravity pulls on different parts of Earth.
  • We experience 2 high tides and 2 low tides every 25 hours.
special types of tides
Special Types of Tides
  • Spring Tides
    • Greatest distance between consecutive high and low tide
    • When Sun, moon and Earth are in a straight line (new moon or full moon phase)
  • Neap Tides
    • Least difference between consecutive low and high tides
    • When the Sun’s pull on the oceans is at a right angle (perpendicular) to the moon’s pull
    • During 1st and 3rd quarter phase