Dictionary term
Obliquity of the Ecliptic
Direct answer
Obliquity of the Ecliptic: The Obliquity of the Ecliptic is the angle between Earth's equatorial plane and its orbital plane, currently about 23.4 degrees.
Obliquity is the approximately 23.4-degree tilt between Earth equator and orbit.
Obliquity is the approximately 23.4-degree tilt between Earth equator and orbit.
A Sun–Earth orientation for seasonal, atmospheric, tidal, and terrestrial terms.Quick reference
- Use when
- Use Obliquity of the Ecliptic in coordinate transformations, season explanations, and long-term orbital-climate studies.
- Do not use it for
- Do not treat 23.5 degrees as timelessly exact; obliquity changes slowly and depends on epoch.
- Reference category
- Seasons & Earth Almanac
- Related terms
- Solar Declination, Axial Tilt, Astronomical Season, Equinox
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The story behind Obliquity of the Ecliptic
Ancient astronomers estimated obliquity from solstitial solar altitudes; modern models track its slow variation.
Obliquity of the Ecliptic in spiritual tradition
Spiritually, obliquity shows how a modest geometric tilt produces profound seasonal variety.
Obliquity of the Ecliptic: 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.
Obliquity of the Ecliptic in numerology
Obliquity of the Ecliptic 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 Obliquity of the Ecliptic matters
Obliquity sets the maximum solar declination and is the primary geometric cause of terrestrial seasons.
Obliquity of the Ecliptic at work: an example
The tropics lie near latitudes equal to the present obliquity because that is the limit of the overhead Sun.
Where interpretation stops
Obliquity of the Ecliptic 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:
- U.S. Naval Observatory: The Seasons and the Earth's Orbit - Official explanation of axial tilt, solstices, equinoxes, perihelion, aphelion, and seasonal sunlight.
- U.S. Naval Observatory Circular 179: The IAU Resolutions on Astronomical Reference Systems, Time Scales, and Earth Rotation Models - Technical reference for TAI, TT, TCG, TCB, TDB, UT1, sidereal time, epochs, and Earth rotation.
- Source
- The Great Almanac Dictionary
- Category
- Seasons & Earth Almanac
- Also appears in
- Seasons & Earth Almanac
- Aliases
- None listed
- Last updated
- 2026-07-16
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Common questions
What is Obliquity of the Ecliptic?
The Obliquity of the Ecliptic is the angle between Earth's equatorial plane and its orbital plane, currently about 23.4 degrees.
How is Obliquity of the Ecliptic used in an almanac?
Use Obliquity of the Ecliptic in coordinate transformations, season explanations, and long-term orbital-climate studies.
What should I avoid when interpreting Obliquity of the Ecliptic?
Do not treat 23.5 degrees as timelessly exact; obliquity changes slowly and depends on epoch.
