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Motions and Their Effects Seasonal Change and Planetary Movement.

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Presentation on theme: "Motions and Their Effects Seasonal Change and Planetary Movement."— Presentation transcript:

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2 Motions and Their Effects Seasonal Change and Planetary Movement

3 Seasons u The tilt of the Earths axis is 23.5 degrees u This tilt causes seasonal changes

4 Winter Solstice u December 21 or 22 u North Pole in darkness for 24 hours u South Pole has continual daylight u Sun is at its lowest point

5 Why do we have winter? u Fewer hours of sunlight during the day u North pole is tilted away from the sun u Light rays are less direct

6 Vernal Equinox (equal) u March 20 or 21 (Spring) u Sun is directly over the equator u Every part of the Earth experiences equal hours of day and night

7 Summer Solstice u June 20 or 21 u South Pole in Darkness u North Pole in Light u Sun appears at its highest point

8 Why we have summer? u Daylight hours are longer u Sunlight is more direct

9 Autumnal Equinox (equal) u September 22 or 23 (Fall) u Equal hours of day and night u Sun is directly over the equator

10 Questions u How many months apart are the solstices and the equinoxes? u How is the vernal equinox similar to the autumnal equinox?

11 Questions u What are the differences between the summer and the winter solstices? u Why do we have changes in seasons during the year?

12 Kepler u Each planet moves in an elliptical orbit (stretched out circle) u Planets speed up their orbit as they approach the Sun and slow down as they move away from it

13 Questions u What was Keplers contribution to the understanding of planetary movement? u TRANSPARENCIES


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