1. If you lived on Mars, which planets would describe retrograde loops? Which would never be… 1 answer below »

1. If you lived on Mars, which planets would describe retrograde loops? Which would never be visible as crescent phases? 2. Galileo’s telescope showed him that Venus has a large angular diameter (61 arc seconds) when it is a crescent and a small angular diameter (10 arc seconds) when it is nearly full. Use the small-angle formula to find the ratio of its maximum distance to its minimum distance. Is this ratio compatible with the Ptolemaic universe shown on page 49? (Hint: See Reasoning with Numbers 3-1.) 3. What is the orbital velocity of an Earth satellite 42,250 km from Earth’s center? How long does it take to circle its orbit once?  

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