Suppose we are viewing Saturn's ring system exactly edge on. How long must we wait until the rings are again edge on? (Assume Saturn's orbital period is 30 years.)

Name: Suppose we are viewing Saturn's ring system exactly edge on. How long must we wait until the rings are again edge on? (Assume Saturn's orbital period is 30 years.)
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Saturn's rings appear edge-on twice during its 30-year orbit around the Sun, so the rings will be edge-on again in half of its orbital period, which is 15 years.

Suppose We Are Viewing Saturn's Ring System Exactly Edge On How