Greenwich Time

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Definition
  1. Noun:
    • The mean solar time at the Royal Observatory in Greenwich, London, used as the primary global time standard: Greenwich Time is the time at the prime meridian (0° longitude), serving as the reference point for Coordinated Universal Time (UTC) and time zones worldwide.
Usage
  • Greenwich Time is used as a historical and technical reference for global timekeeping. It is the basis from which all other time zones are calculated (e.g., GMT+1, GMT-5).
  • It is often used in contexts like navigation, astronomy, aviation, and international communications to avoid confusion between different local times.
Examples
  • Noun:
    • The conference call is scheduled for 14:00 Greenwich Time.
    • Before traveling, pilots must calculate the flight duration based on Greenwich Time.
    • Many historical scientific observations were recorded in Greenwich Time.
Advanced Usage
  • "on Greenwich Time": operating or synchronized according to this standard.
    • The global network of servers runs on Greenwich Time to ensure data consistency.
Variants and Related Words
  • GMT (abbreviation): Greenwich Mean Time. This is the direct abbreviation and most common variant.
    • Please convert your local time to GMT.
  • UTC (Coordinated Universal Time): The modern, more precise successor to GMT, often used interchangeably in general contexts but based on atomic clocks.
  • Zulu Time (Z): A term used in military and aviation contexts to denote UTC/GMT.
Synonyms
  • Universal Time (UT): A general term for time based on the Earth's rotation, with GMT being a specific implementation.
  • World Time: A less technical synonym implying a single reference time for the globe.
Related Phrases
  • Greenwich Mean Time (GMT): The full name of the time standard.
    • The treaty was signed at noon Greenwich Mean Time.
Noun
  1. the local time at the 0 meridian passing through Greenwich, England; it is the same everywhere

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