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Homework answers / question archive / The Moon is at a distance of 240,000 miles
The Moon is at a distance of 240,000 miles. If your friend stands on the Moon holding a 12-inch ruler, what approximate angular resolution would your telescope need to have to measure the extent of the ruler? Express your answer in arcseconds. Draw a diagram showing the overall geometry and label it.
NOTE: there are 63,360 inches in a mile and about 57 degrees in a radian.