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Copyright © 2011 InteractiveScienceLessons.com handout.

Mar 26, 2015

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Page 1: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com handout

Page 2: 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

Page 3: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com

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

Page 4: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com

North Pole

South Pole

set up flashlight

15 N.

30 N.

45 N.

15 S.

30 S.

45 S.

equator

axis

Page 5: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com

20 cm

Flashlight is parallel with table

mark red line in north

Lean the northern hemisphere towards flashlight

Page 6: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com move light to southern

15

38

23

Page 7: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com Mark blue line in south

Page 8: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com comparison

NºSº -

Nºx 100 =

44%

15

48

33

23º33º -

23ºx 100 =

Page 9: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com 2.blanks-revolution

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

Page 10: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com

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

Page 11: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com Compare axes

Page 12: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com

See how earth’s axis stays tilted the same all the way

around the sun?

finish-arrows, label

Page 13: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com

summer

winter

summer

winter

2 summary statements

?

?

?

?

Page 14: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com

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

Page 15: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com

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

Page 16: Copyright © 2011 InteractiveScienceLessons.com handout.

Copyright © 2011 InteractiveScienceLessons.com

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