Fig. 10.2. The orbit of Uranus relative to Neptune.

of Neptune about 60 190 days; hence, the period of Uranus relative to Neptune is (1/30685 - 1/60190)-1 days, or approximately 171.4 years. Uranus was at is closest to Neptune in 1822, and so the angle 0 marked in the figure, giving the point on the orbit relative to the point of closest approach, can be represented by year — 1822

0 0

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