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Use Kepler's second law (Chapter 4) to calculate the ratio of Mercury's orbital speed at perihelion to its speed at aphelion.

Suppose Mercury's rotation period were four-fifths of its orbital period. How many Mercury days would there be in a Mercury year?

Find the synodic period of Venus and the Earth. What does the synodic period of Venus have to do with the interval of time between appearances of Venus in the western sky in the evening?

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