Greenwich Mean Time

**Greenwich Mean Time**
Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It serves as a global time standard against which all other time zones are referenced. Originally established to help mariners navigate, GMT plays a crucial role in international timekeeping, aviation, computing, and telecommunications. Used interchangeably with Coordinated Universal Time (UTC) in many contexts, GMT remains a fundamental concept for understanding world clocks and time zone differences.