


What is Postmeridian? Definition, Time Interval, and Examples
Postmeridional refers to the time period after meridian, which is the highest point of the sun in the sky. In other words, it refers to the afternoon or later part of the day.
In astronomy and navigation, the term "postmeridian" is used to describe the time interval between the meridian passage of a celestial object (such as the Sun or a star) and its next meridian passage. This interval can be several hours or even days, depending on the object's position in the sky and the observer's location.
For example, if the Sun crosses the meridian at 12:00 PM local time, it will be in the postmeridian period from 12:00 PM to 6:00 PM (assuming a 12-hour clock). During this time, the Sun will continue to move westward in the sky and its altitude will decrease as the day progresses.



