2. Seasons caused by revolution and inclination
characterized by differences in average temperature and the amount of time that the sun is in the sky each day.

3. The hemisphere that is tilted toward the sun;
has a longer day, receives more of the sun’s rays,
and receives them more directly than the hemisphere tilted away from the sun.

7. Seasons
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8. If the earth’s axis was not tilted, each night and day everywhere on the earth would always be 12 hours long and there would be no seasons.
Would there be any variation in weather and climate?

9. June solstice (Summer in N)
Sun is directly overhead noon June 21 at the tropic of cancer
N hemisphere is tipped towards the sun thus receiving more insolation,
S hemisphere more in shadow, beginning of winter

10. September Equinox midway between solstices
poles are equal distance from the sun
sun directly overhead on equator
both hemispheres receive equal sunlight
beginning of fall in North

11. December solstice shortest day of year (North)
North Pole completely dark
South Pole continuous sunlight

12. March Equinox beginning of Spring in North
beginning of Autumn in South

14. Angle of Sunlight (1)
Throughout the year the elevation of the noon day sun alternately gets higher and then lower in the sky!

15. Angle of Sunlight (2)
From the winter solstice the noonday sun gradually gets higher in the sky until it reaches a max on the summer solstice!
Suns rays have maximum intensity, max daylight

16. Angle of Sunlight (3)
From the summer solstice the noonday sun gradually gets lower in the sky until it reaches a minimum on the winter solstice!
Suns rays have minimum intensity, min daylight

17. Seasons

18. Answer UC questions p 509
1, 2, 4