Am and pm mean

Answer 1

AM = "Ante - Meridian"

PM = "Post - Meridian"

"Ante" and "post" mean "before" and "after".

"Meridian" is the imaginary line in the sky that runs north/south and passes directly over you.

In the morning, the sun moves from the eastern horizon toward the meridian. At Noon, the sun crosses the meridian. In the afternoon, the sun has crossed the meridian and moves away from it toward the west.

Morning is the time before the sun crosses the meridian = Ante-Meridian = AM.

Afternoon and evening is the time after the sun crosses the meridian = Post-Meridian = PM.