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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How does the Earth move in space?
What causes the cycle of the seasons on Earth?
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)
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)
Occur halfway between solstices
Day and night are both 12 hours long
Vernal (spring) = March 21
Autumnal (fall) = Sept. 22