* The Prime Meridian is a line of longitude, not a time zone. It marks 0 degrees longitude and serves as a reference point for calculating other longitudes.
* Time zones are based on the Earth's rotation. The Earth rotates 360 degrees in 24 hours, meaning each hour corresponds to 15 degrees of longitude (360/24 = 15).
How Time Zones Work:
1. Standard Time: The world is divided into 24 time zones, each roughly 15 degrees of longitude wide. The Prime Meridian (0 degrees longitude) is used as the starting point for these zones.
2. Local Time: Each time zone has a specific time that is based on its distance from the Prime Meridian. For example, Greenwich Mean Time (GMT) is the time at the Prime Meridian.
3. Calculating Time: To determine the time in a particular time zone, you need to know its longitude and the time at the Prime Meridian.
* East of the Prime Meridian: Add 1 hour for every 15 degrees of longitude eastward.
* West of the Prime Meridian: Subtract 1 hour for every 15 degrees of longitude westward.
In summary:
* The Prime Meridian helps define the reference point for time zones.
* You need to know the location's longitude and the time at the Prime Meridian (GMT) to calculate the local time.
