Study Figures 4-11 and 4-16 and describe the phases that Venus would have displayed to Galileo’s telescope if the Tychonic universe had been correct.
Figure 4-11 Tycho’s model of the Universe retained the first principles of classical astronomy; it was geocentric with the Sun and Moon revolving around Earth, but the planets revolved around the Sun. All motion was along circular paths.
Figure 4-16 (a) If Venus moved in an epicycle centered on the Earth-Sun line (see Figure 3b in the Chapter 2 Concept Art: An Ancient Model of the Universe), it would always appear as a crescent. (b) Galileo observed through his telescope that Venus goes through a full set of phases, proving that it must orbit the Sun.
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Chapter 4 Solutions
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