The headquarters of Greenwich Mean Time (GMT) is situated in:

🧠 Explanation:

Greenwich Mean Time (GMT) is headquartered in England, specifically at the Royal Observatory in Greenwich, London. Established as the global time standard in the 19th century, GMT is the basis for Coordinated Universal Time (UTC). Its adoption standardized global navigation, trade, and communication, reflecting England’s historical maritime dominance. The Greenwich meridian, at 0° longitude, remains a reference for time zones worldwide. GMT’s significance lies in its role in synchronizing global activities, from aviation to finance, highlighting England’s contribution to global timekeeping and its enduring impact on international coordination.