The Moon is at a distance of 240,000 miles

Biology Nov 19, 2020

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.