What does AM and PM mean in time?
I don't know what that means? Anyone know what AM ans PM mean?
AM means Anti Meridian, which means "before the sun has reached the
meridian you are on." That is the morning. PM means Post Meridian, which
means "after the sun has reached the meridian you are on." That is the afternoon.
It really refers to a standard meridian, which is every 15 degrees around the globe.
That is why large swaths of the country are in the same time zone. People near the
western side of the time zone experience "noon" before the sun is actually overhead.
People on the eastern side of the time zone experience "noon" after the sun has
passed them.
AM and PM have their roots in Latin, which is the basis of nearly all early scientific
terms.