Dictionary term
Meridian Circle
Direct answer
Meridian Circle is a telescope constrained to the meridian and combined with graduated circles for measuring star positions.
Meridian Circle is a precision transit-and-altitude telescope used in historical astronomy, timekeeping, or navigation.
Meridian Circle is a precision transit-and-altitude telescope used in historical astronomy, timekeeping, or navigation.
An engraved functional orientation; the page explains the real instrument, method, or publication.Quick reference
- Use when
- Use Meridian Circle by calibrating level, collimation, circle division, refraction, and clock corrections for a meridian observation.
- Do not use it for
- Flexure, refraction, pivot error, and catalogue-clock assumptions must be reduced before publishing a position.
- Reference category
- Historical Almanacs & Instruments
- Related terms
- Plumb Line, Gnomon, Transit Instrument, Mural Quadrant
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The story behind Meridian Circle
Meridian circles became foundational nineteenth- and twentieth-century instruments for positional astronomy.
Meridian Circle in spiritual tradition
Meridian Circle rewards careful observation, explicit assumptions, and humility about the limits of every model or measurement.
Meridian Circle: fact and faith, kept distinct
This is a factual history-of-science, instrument, timekeeping, or navigation reference. It may support wonder and disciplined attention without becoming a claim of fate, worship, or private revelation.
Meridian Circle in numerology
Meridian Circle 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 Meridian Circle matters
Meridian Circle matters because timing transit and measuring zenith distance together supported precise catalogues and observatory reference frames.
Meridian Circle at work: an example
A star's transit time yields right ascension while the circle reading helps determine declination.
Where interpretation stops
Meridian Circle 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:
- Royal Museums Greenwich: Astronomical and Navigational Instruments - Museum reference collection for historical observing, calculating, timekeeping, and navigation instruments.
- Royal Museums Greenwich: A Unique History of Timekeeping - Museum overview of marine chronometers, astronomical regulators, and the development of precision timekeeping.
- Source
- The Great Almanac Dictionary
- Category
- Historical Almanacs & Instruments
- Also appears in
- Historical Almanacs & Instruments
- Aliases
- None listed
- Last updated
- 2026-07-16
Explore Meridian Circle
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More in Historical Almanacs & Instruments
- Orrery
- Regulator Clock
- Sun Sight
- Astronomical Quadrant
- Compass Rose
- Equinoctial Ring Dial
- Line of Position
Common questions
What is Meridian Circle?
Meridian Circle is a telescope constrained to the meridian and combined with graduated circles for measuring star positions.
How is Meridian Circle used in an almanac?
Use Meridian Circle by calibrating level, collimation, circle division, refraction, and clock corrections for a meridian observation.
What should I avoid when interpreting Meridian Circle?
Flexure, refraction, pivot error, and catalogue-clock assumptions must be reduced before publishing a position.
