What is A.M and P.M tells us?

We are use A.M. for the morning hours and P.M. or afternoon and evening hours. But not
many of us know the meaning of A.M. and P.M.

        In Latin, the word MERIDIES means midday or noon. The sun is usually directly over
-head at noon time.The day was divided into two parts,i.e., one before noon while the sun
was rising,and one after noon when the sun was travelling towards sunset.

      In Latin,ANTE means before and POST means after. So the hours before noon

were called Ante meridies hours and became A.M.or a.m.Hours after midday were called

post meridies shortened to P.M. or p.m.