After Americans declared independence on July 4, 1776, a waning gibbous moon rose in the night sky. To the people celebrating the birth of a new nation, it would have looked much the same as the moon we see today. But there was one subtle difference: 250 years ago, the moon was about 31 feet (9.4 meters) closer to Earth than it is now."The moon is currently drifting away from Earth at a rate of about 3.8 centimeters [1.5 inches] per year, which …
The moon that lit the sky on the night of July 4, 1776, when the United States Declaration of Independence was signed, was about 9.4 meters closer to Earth than it is now. Moreover, in the century...