“In 1969, NASA’s Apollo missions installed reflective panels on the moon. These have shown that the moon is currently moving 3.8 cm away from the Earth every year.” The USA is one of the few countries still using the Imperial system of measurement, where things are measured in feet, inches, pounds, ounces, and so forth. Divide the length value by 2.54. Thus, 3.8/2.54 = 1.49606299. Round up to a tenth, which is 1.5, or 1 ½ inches. https://www.space.com/moon-drifting-away-from-earth-2-5-billion-years
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