Copyright © 2011 InteractiveScienceLessons.com handout
Mar 26, 2015
Copyright © 2011 InteractiveScienceLessons.com handout
Copyright © 2011 InteractiveScienceLessons.com
Two factors cause EarthTwo factors cause Earth’’s seasons:s seasons:
1. The _____ of earth1. The _____ of earth’’s axis.s axis.
• It leans _____
• Is the result of a massive _____________ , perhaps
the same one that created the ________
2. The _________________ of earth around the sun2. 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
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1. The _____ of earth1. The _____ of earth’’s axis.s axis.
•It leans _______
•Is the result of a massive _____________ , perhaps
the same one that created the ________
tilt23 ½
collisionmoon
Label degrees
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North Pole
South Pole
set up flashlight
15 N.
30 N.
45 N.
15 S.
30 S.
45 S.
equator
axis
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20 cm
Flashlight is parallel with table
mark red line in north
Lean the northern hemisphere towards flashlight
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15
38
23
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NºSº -
Nºx 100 =
44%
15
48
33
23º33º -
23ºx 100 =
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Same light, same distance, but the tilt causes it to be 44% more concentrated in the northern hemisphere.
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2. The _________________ of earth around the sun2. 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
revolution66,000365.26
600,000,000
diagram-add axis/equator
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See how earth’s axis stays tilted the same all the way
around the sun?
finish-arrows, label
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summer
winter
summer
winter
2 summary statements
?
?
?
?
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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
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Homework- Consequences. What if…
(stand your earth straight up and move it around your sun)
(keep it tilted, but don’t revolve around the sun)
II. …the earth suddenly stopped revolving around the sun?
I. …the earth’s axis was not tilted?
matching
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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