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Earth Moon Sun Relationships. Rotation versus Revolution RotationRotation is the turning of a body about an axis. –The earth rotates once every 24 hours.

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Presentation on theme: "Earth Moon Sun Relationships. Rotation versus Revolution RotationRotation is the turning of a body about an axis. –The earth rotates once every 24 hours."— Presentation transcript:

1 Earth Moon Sun Relationships

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

3 What is Insolation? 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.

4 Examples of Insolation

5 Why Does the Length of Day on Earth Change? The t tt tilt of the Earth’s axis, and the rotation and revolution of the Earth is responsible for the changes in the length of day and night.

6 Equal Day and Night Vernal and Autumnal Equinox Sun is directly over the Equator

7 Longer Days, Shorter Nights In Northern Hemisphere Sun is directly over the Tropic of Cancer

8 Shorter Days, Longer Nights in Northern Hemisphere Sun is directly over the Tropic of Capricorn

9 Why Do We Have Seasons? tilt of the Earth’s axis revolution around the SunThe tilt of the Earth’s axis and the revolution around the Sun cause the Earth to have seasons.

10 Effects of axis tilt

11 Effects of revolution

12 Combined Effects of Tilt and Revolution

13 Earth’s Seasons - Year

14 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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18 What is a Solar Eclipse? SolarSun blockedA 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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21 Phases of a solar eclipse

22 Solar eclipse, notice solar prominence in carona.

23 Solar Eclipse

24 What is a Lunar Eclipse? A Lunar eclipse is when the moon is blocked by the shadow of the earth. –The moon’s orbital path takes it into the shadow of the earth.

25 Phases of a Lunar eclipse

26 Solar versus Lunar Eclipse Note: Solar eclipse = sun blocked; Lunar eclipse = moon blocked

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