Understanding GMT: What Does Greenwich Mean Time Mean?

Learn what GMT (Greenwich Mean Time) is and its importance in global timekeeping.

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GMT stands for Greenwich Mean Time. It is the mean solar time at the Royal Observatory in Greenwich, London, considered as the world's time standard. GMT is used as the basis for calculating time throughout much of the globe, serving as the prime meridian (0° longitude). It plays a crucial role in international timekeeping and is critical for functions such as aviation, computing, and navigation.

FAQs & Answers

  1. What is the difference between GMT and UTC? GMT is a time standard that reflects the mean solar time at the Royal Observatory in Greenwich, while UTC (Coordinated Universal Time) is a time standard based on atomic timekeeping and is more precise.
  2. Why is GMT important for aviation? GMT is crucial for aviation as it helps in scheduling flights and ensuring all global timings synchronize, especially for international travel.
  3. How does GMT affect global communications? GMT serves as a reference time for coordinating communications across different time zones, ensuring accurate timing for broadcasts and online activities.