How long would it take for an observer using binoculars to notice the Moon’s terminator moving?

With the Moon’s terminator moving almost 10 mph (16 km/h) across its equator, how long would it take for an observer using binoculars to notice a change in lunar features? Gary GarcharSan Jose, California The lunar terminator, the sunset/sunrise line that sweeps across the Moon’s surface as the Moon orbits Earth, travels at a rateContinue reading “How long would it take for an observer using binoculars to notice the Moon’s terminator moving?”
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