HW#4: pg. 57 Rev 1 – 3, CST 1 – 3
Rev 1 – 3
1. What contributions to astronomy were made by Chinese and Islamic astronomers during the Dark Ages in Europe?
2. Briefly describe the geocentric model of the universe and explain why it was accepted for so long.
3. The benefit of our current knowledge lets us see flaws in the Ptolemaic model of the universe. What is its basic flaw?
CST 1 – 3
1. Planets near opposition (a) rise in the east; (b) rise in the west; (c) do not rise or set; (d) have larger deferents.
2. A major flaw in Copernicus's model was that it still had (a) the Sun at the center; (b) Earth at the center; (c) retrograde loops; (d) circular orbits.
3. As shown in Figure 2.12 ("Venus Phases"), Galileo's observations of Venus demonstrated that Venus must be (a) orbiting Earth; (b) orbiting the Sun; (c) about the same diameter as Earth; (d) similar to the Moon.