Dictionary term
Sundial
Direct answer
Sundial: A Sundial is an instrument that indicates local apparent solar time from the position of a shadow or spot of light cast by the Sun onto a calibrated surface.
A Sundial tells local apparent solar time from the Sun's shadow.
An engraved functional orientation; the page explains the real instrument, method, or publication.Quick reference
- Use when
- Use a Sundial designed and aligned for its orientation and latitude, then account for longitude within the time zone, the equation of time, and daylight-saving rules when comparing it with a clock.
- Do not use it for
- A decorative dial may be misaligned or latitude-specific, and no sundial can read the Sun through cloud or ordinary nighttime darkness.
- Reference category
- Historical Almanacs & Instruments
- Related terms
- Almanac, Astronomical Almanac, Nautical Almanac, Astrolabe
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The story behind Sundial
Shadow clocks and sundials appeared in many ancient societies and developed into portable, architectural, and precision forms with specialized hour lines.
Sundial in spiritual tradition
A sundial returns timekeeping to light, place, season, and the visible rotation of Earth.
Sundial: fact and faith, kept distinct
This is a factual astronomy, calendar, Earth-science, cultural, or historical reference. It can support wonder at the created order without becoming a claim of fate, worship, or private revelation.
Sundial in numerology
Sundial 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 Sundial matters
It makes Earth's rotation and the Sun's changing apparent path visible, while exposing the difference between local solar time and standardized clock time.
Sundial at work: an example
A correctly aligned horizontal dial may read solar noon when the Sun crosses the local meridian even though the civil clock does not show 12:00.
Where interpretation stops
Sundial 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: Horizontal Pedestal Dial - Museum documentation of a historical sundial, its gnomon, hour circle, meridian alignment, and latitude.
- NIST: Local Time Frequently Asked Questions - Official reference for civil time zones and daylight-saving rules.
- U.S. Naval Observatory: Universal Time - Official explanation of Universal Time and its relationship to Greenwich timekeeping.
- Source
- The Great Almanac Dictionary
- Category
- Historical Almanacs & Instruments
- Also appears in
- Historical Almanacs & Instruments
- Aliases
- None listed
- Last updated
- 2026-07-15
Compare solar time with clock time
Sundial in a book is one thing; Sundial 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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More in Historical Almanacs & Instruments
- Almanac Ephemeris
- Astronomical Table
- Computus
- Filar Micrometer
- Local Hour Angle
- Meridian Table
- Pendulum Clock
- Right Ascension Table
Common questions
What is Sundial?
A Sundial is an instrument that indicates local apparent solar time from the position of a shadow or spot of light cast by the Sun onto a calibrated surface.
How is Sundial used in an almanac?
Use a Sundial designed and aligned for its orientation and latitude, then account for longitude within the time zone, the equation of time, and daylight-saving rules when comparing it with a clock.
What should I avoid when interpreting Sundial?
A decorative dial may be misaligned or latitude-specific, and no sundial can read the Sun through cloud or ordinary nighttime darkness.
