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Motions - o o What if no tilt No seasons Motions of the...

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Motions: yearly motion arise from the orbit of Earth around the Sun causes different stars to be visible at different times of year in our night sky stars which are behind the sun in space are in the daytime sky and not visible from  Earth combined with the tilt of the Earth's rotation axis, causes seasons Seasons:  (this is from p. 144 in the 2nd edition)   Why do we have temperature changes ? distance from Sun changing ?  ........  NO, distance changes very little during summer, Sun's rays strike more directly o more efficient heating o See Figures 1.8 and 1.9  ....  Here is a link to the figures.  (figure 4.23 in  the 2nd edition) o   o   length of daylight is longer in summer
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o more time to heat up
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Unformatted text preview: o o What if no tilt ? . ......... No seasons. Motions of the Earth-Moon-Sun system Phases of the Moon The appearance of the moon changes in a repeating manner called the phases of the moon. You can figure out the phase of the moon by drawing a line from the Earth (blue) to the Moon. Then draw a line through the moon which is perpendicular to the Earth-moon line. Anything on the Earth side of this line will be visible from Earth. In the case shown above, there is more light part of the moon visible than dark. The result will be that we see a "gibbous" moon as show in the right side. "gibbous" - from the Latin for "round and bulging" ....
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