How does longitudes to calculate time?

Longitudes are used to calculate time by dividing the Earth into 24 time zones, each corresponding to 15 degrees of longitude. Since the Earth rotates 360 degrees in approximately 24 hours, it takes about one hour for the sun to move across 15 degrees. As a result, local time changes by one hour for every 15 degrees of longitude east or west from a reference point, typically the Prime Meridian at 0 degrees longitude. This allows for standardized timekeeping across different regions of the world.