1. Seasons
handout

2. 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

3. 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

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

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

6. 38
23
15
move light to southern

7. Mark blue line in south

8. Sº - Nº
x 100 =
15 Nº
33
48
33º -
23º
x 100 =
44%
23º
comparison

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

10. 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

11. Compare axes

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

13. ?
winter ?
summer ?
summer ?
winter
2 summary statements

14. 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

15. 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

16. 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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