Earth’s Seasons

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Earth’s Seasons Brought to you by the earth’s 23.5º tilt

Transcript of Earth’s Seasons

Page 1: Earth’s Seasons

Earth’s Seasons

Brought to you by the earth’s 23.5º tilt

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Rotation:Earth spinning on its axis.

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Revolution:Earth’s yearly trip around the sun.

Another word for revolution is orbit.

Earth revolves around the sun in an ellipse (similar to an oval).

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Why do we have seasons? Is it the distance from the sun that causes

them?

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No, it’s the tilt of Earth on its axis that causes the seasons:

Axis: the imaginary line about which a rotating body, such as the earth, turns.

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Summer

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Winter

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Solstice

• 1st day of summer (June 21 or 22) or winter (Dec 21 or 22).

• Longest day of the year (summer) or shortest day of the year (winter).

• Sun shines at its northernmost or southernmost points of the year.

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Fall or Spring

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Equinox

• 1st day of fall (September 22 or 23) or spring (March 20 or 21).

• Day and night are equal.

• Sun shines directly over the equator, equally on the northern and southern hemispheres.

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