# Seasons handout.

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Seasons handout

Seasons Two factors cause Earth’s seasons:
1. The _____ of earth’s axis. It leans _____  Is the result of a massive _____________ , perhaps the same one that created the ________ 2. The _________________ of earth around the sun. Average speed: _________ mph It takes earth ____________ days to make the ________________ mile journey But it’s always in the same place on the same day every year 1.blanks-rotation

tilt 23 ½ collision moon 1. The _____ of earth’s axis.
It leans _______  Is the result of a massive _____________ , perhaps the same one that created the ________ tilt 23 ½ collision moon Label degrees

axis 45 N. 30 N. North Pole 15 N. equator 15 S. 30 S. 45 S.
South Pole set up flashlight

Flashlight is parallel with table
20 cm Lean the northern hemisphere towards flashlight mark red line in north

38 23 15 move light to southern

Mark blue line in south

- x 100 = 15 33 48 33º - 23º x 100 = 44% 23º comparison

Same light, same distance, but the tilt causes it to be 44% more concentrated in the northern hemisphere. 2.blanks-revolution

2. The _________________ of earth around the sun.
Average speed: _________ mph It takes earth ____________ days to make the ________________ mile journey But it’s always in the same place on the same day every year revolution 66,000 365.26 600,000,000 diagram-add axis/equator

Compare axes

See how earth’s axis stays tilted the same all the way around the sun?
finish-arrows, label

? winter ? summer ? summer ? winter 2 summary statements

Summary The tilt of the axis causes the hemisphere leaning towards the sun to receive more concentrated sunlight As the earth moves around the sun, the hemisphere leaning towards the sun changes consequences

Homework- Consequences. What if…
I. …the earth’s axis was not tilted? (stand your earth straight up and move it around your sun) II. …the earth suddenly stopped revolving around the sun? (keep it tilted, but don’t revolve around the sun) matching

Seasons- matching exercise
Easter Set clocks ahead one hour Set clocks back one hour Harvest moon Groundhog Day Blue Moon Equinox (1st day of spring or fall) Summer Solstice (longest day) Winter Solstice (shortest day) An unusual 5th full moon during a quarter of the year The first full moon after the autumnal equinox When the sun is directly over the Tropic of Capricorn The first Sunday following the 1st full moon on/after vernal equinox The second Sunday in March When the sun is directly over the equator The second Sunday in November Four days before the cross-quarter (mid-point between winter/spring) When the sun is directly over the Tropic of Cancer

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