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Earth in Space. How does the Earth move in space? What causes the cycle of the seasons on Earth?. How Earth Moves…. Rotation – spins on it’s axis Causes day and night One rotation = 24 hours Revolution – travels around the sun One revolution = one year (365 ¼ days)

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earth in space

Earth in Space

How does the Earth move in space?

What causes the cycle of the seasons on Earth?

how earth moves
How Earth Moves…
  • Rotation – spins on it’s axis
    • Causes day and night
    • One rotation = 24 hours
  • Revolution – travels around the sun
    • One revolution = one year (365 ¼ days)
    • Every 4 years is a leap year (366 days)
    • Earth travels in an elliptical (oval) orbit around the sun
seasons
Seasons…

Sunlight hits Earth at different angles

Earth has seasons because it is tilted on it’s axis

Each hemisphere is tilted toward the sun for part of the year (summer) and away from the sun for part of the year (winter)

solstices
Solstices…

Summer solstice (June 21) = Sun is farthest north of the equator in the Northern hemisphere, or farthest south of the equator in the Southern hemisphere (longest day)

Winter solstice (Dec 21)= Sun is farthest south of the equator in the Northern hemisphere, or farthest north of the equator in the Southern hemisphere (shortest day)

equinoxes
Equinoxes….

Occur halfway between solstices

Day and night are both 12 hours long

Vernal (spring) = March 21

Autumnal (fall) = Sept. 22

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