Question

what is antimeridian and postmedian . expand it briefly ​

Answer 1

Answer:

Ante Meridiem(a.m) denotes the time after midnight and before noon: e.g. 2 a.m.,6 a.m.,10 a.m.etc. While Post Meridiem(p.m) denotes the time after noon and before midnight: e.g. 3 p.m.,7:30p. m.,11 p.m. etc.

Answer 2

Answer:

In English system the day starts at midnight and ends at the next midnight. 

The day begins just after 12 o’clock at midnight. The next 12 o’clock in the day time is called midday. Then the next 12 o’clock is the next midnight. 

The time from a midnight to coming midday is called antemeridian. It is written in short as a.m. We say the time between midnight and noon is called a.m. 

The time between 12 o’clock of the day, i.e., midday to next midnight is known as postmeridian. It is written in short as p.m. 

We say the time between midday (noon) to next midnight is called p.m.