Unformatted text preview: see the phases (shadowing) of Venus, would that have given him any doubts about his model? Explain why or why not. 4. Mars in its path through the sky sometimes loops backwards . Explain in your own words why this happens (a) using Ptolemy’s model, and (b) with our present-day picture of the Solar System. 5. (a) Explain, with a diagram, what is meant by the "Ecliptic". What is the "Zodiac"? (b) Find from a calendar the dates of the Winter Solstice, the Summer Solstice, the Spring Equinox and the Autumn Equinox. Draw a sketch of the Earth's path around the Sun, showing where it is on these four days, including an indication of the angle between the North Pole-South Pole axis and the direction to the Sun. (c) Count the days exactly in the four quarters of the year between solstices and equinoxes. Are these periods all the same length? Would you expect them to be? Explain....
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- Fall '08