Earth Moon Sun Relationships

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Earth Moon Sun Relationships
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Rotation versus Revolution

• Rotation is the turning of a body about an axis.
• The earth rotates once every 24 hours.
• Revolution is the motion of one body around
  another.
• The earth revolves around the sun once every 364
  ¼ days.

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What is Insolation?
Insolation is the amount of radiation per area
that reaches the earths surface. The more direct
the suns rays hit the surface, the greater the
amount of surface heating.
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Examples of Insolation
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Why Does the Length of Day on Earth Change?

• The tilt of the Earths axis, and the rotation
  and revolution of the Earth is responsible for
  the changes in the length of day and night.

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Equal Day and NightVernal and Autumnal Equinox
Sun is directly over the Equator
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Longer Days, Shorter NightsIn Northern Hemisphere
Sun is directly over the Tropic of Cancer
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Shorter Days, Longer Nightsin Northern Hemisphere
Sun is directly over the Tropic of Capricorn
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Why Do We Have Seasons?

• The tilt of the Earths axis and the revolution
  around the Sun cause the Earth to have seasons.

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Effects of axis tilt
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Effects of revolution
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Combined Effects of Tilt and Revolution
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Earths Seasons - Year
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Why Does The Moon Have Phases?

• Phases of the moon are determined by
• The relative positions of the earth, moon and
  sun.
• Revolution of moon around the earth.
• Your position on the earth.

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What is a Solar Eclipse?

• A Solar Eclipse is when the Sun is blocked from
  view by the moon.
• The moons orbital path places it in between the
  earth and the sun.

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Phases of a solar eclipse
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Solar eclipse, notice solar prominence in carona.
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Solar Eclipse
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What is a Lunar Eclipse?

• A Lunar eclipse is when the moon is blocked by
  the shadow of the earth.
• The moons orbital path takes it into the shadow
  of the earth.

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Phases of a Lunar eclipse
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Solar versus Lunar Eclipse
Note Solar eclipse sun blocked Lunar eclipse
moon blocked