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Dictionary term

Greenwich Mean Time

Direct answer

Greenwich Mean Time is mean solar time at the Greenwich meridian, historically used as a world time reference.

Calendars & TimekeepingThe Great Almanac DictionaryUpdated 2026-07-16
Calendar and clock · visual guide Greenwich Mean Time

Greenwich Mean Time is the historical mean-solar time reference at Greenwich.

A cycle or timeline schematic for comparing the named timekeeping concept.

Quick reference

Use when
Use Greenwich Mean Time when a source explicitly uses GMT, then clarify its intended modern time scale.
Do not use it for
Do not assume GMT is a fully precise synonym for UTC in technical calculations.
Reference category
Calendars & Timekeeping
Related terms
Equation of Time, Terrestrial Time, Calendar, Julian Date

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The story behind Greenwich Mean Time

British navigation, railways, telegraphy, and international meridian agreements spread Greenwich-based timekeeping.

Greenwich Mean Time in spiritual tradition

Spiritually, GMT illustrates how a chosen meridian became a practical global convention rather than a natural center of time.

Greenwich Mean Time: fact and faith, kept distinct

This is a factual calendar, astronomy, Earth-science, cultural-history, or observational reference. It can support wonder and practical planning without becoming a claim of fate, spiritual causation, or private revelation.

Greenwich Mean Time in numerology

Greenwich Mean Time is not a numerology claim. Any numbers attached to it should retain their ordinary scientific, calendrical, navigational, or historical meaning unless a separate symbolic interpretation is clearly labeled.

Why Greenwich Mean Time matters

GMT remains common in public language, but precise modern work distinguishes UTC and UT1.

Greenwich Mean Time at work: an example

A historical nautical almanac observation may give Greenwich Mean Time where a modern dataset would specify UT1 or UTC.

Where interpretation stops

Greenwich Mean Time is presented as sourced astronomy, calendrical, Earth-science, cultural, or instrument-history reference. Definitions should distinguish measured phenomena from civil convention and historical interpretation, preserve location and time dependencies, and avoid turning factual sky data into a deterministic personal claim.

Sources and editorial method

Research references used for this entry include:

Source
The Great Almanac Dictionary
Category
Calendars & Timekeeping
Also appears in
Calendars & Timekeeping
Aliases
None listed
Last updated
2026-07-16

Translate the Greenwich reference

Greenwich Mean Time in a book is one thing; Greenwich Mean Time in your own birth chart is your life. The Oracle casts your real chart and tells you what it means for your love, your work, and your year ahead, in conversation, free.

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Equation of TimeThe Equation of Time is the seasonal offset between sundial time and mean clock time. Terrestrial TimeTerrestrial Time is the uniform geocentric time argument used for astronomical ephemerides. CalendarA Calendar organizes days into named and numbered cycles for reckoning time. Julian DateJulian Date is a continuous astronomical count of days and day fractions. Coordinated Universal TimeCoordinated Universal Time is the international reference standard for world time. Sidereal TimeSidereal Time is star-based rotational time used to orient the sky.

More in Calendars & Timekeeping

Common questions

What is Greenwich Mean Time?

Greenwich Mean Time is mean solar time at the Greenwich meridian, historically used as a world time reference.

How is Greenwich Mean Time used in an almanac?

Use Greenwich Mean Time when a source explicitly uses GMT, then clarify its intended modern time scale.

What should I avoid when interpreting Greenwich Mean Time?

Do not assume GMT is a fully precise synonym for UTC in technical calculations.

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