Where did the name full moon come from?

Answer 1

If you watch the moon each night, it rises on the eastern horizon about one hour later, and bounces back more and more sunlight until the sunlight is nearly maximized--at which point the moon is said to be "full." The name comes from the filling up of the lunar surface with reflected sunlight.

Answer 2

The term "full moon" originated from its appearance when the moon is completely illuminated as seen from Earth. This occurs when the Earth is between the sun and the moon, with the sun's light reflecting off the moon's surface, making it appear fully illuminated.