How to calculate longitude with time?
To find his longitudethe method is a priori very simple: you just need to know your time difference with the meridian chosen as the origin (today, that of Greenwich). 1 hour of offset corresponds to 360/24=15 degrees of longitude.
The main objective is to be able to go around the world. The times are based on different meridians according to the decisions of the authorities of each country or locality. Each type of time zone has certain consequences in the daily life of each country.
Time zones are usually defined by governments or by an astronomy institute and are represented by a 3 or 4 letter code. See Section 3.2, “Examples of Time Zones” for examples.
This is why time zones are developed. Time zones originated from dividing our planet into 24 sections using the zero meridian as a reference. Meridian texts can be found on a coordinate map. It becomes a useful resource for organizing your time. Each time zone measures 15 degrees.
For practical reasons, these zones tend to follow the borders of countries or their subdivisions. Usually they differ from Coordinated Universal Time by a whole number of hours, but a few are off by 30 or 45 minutes.