What does GMT stand for in timekeeping?

In timekeeping, GMT stands for Greenwich Mean Time. This term refers to the mean solar time at the Royal Observatory in Greenwich, London, which is situated on the Prime Meridian (0 degrees longitude). GMT is used as a standard for timekeeping worldwide and serves as a point of reference for different time zones. It plays a crucial role in navigation and international time coordination, determining how different regions relate to the standard time benchmark. The use of GMT helps in synchronizing time across various countries, making it a fundamental aspect of global timekeeping practices.

Other options, while they may contain some elements related to time, do not accurately define GMT in the context of established timekeeping systems.