Dictionary term
Argument of Periapsis
Direct answer
Argument of Periapsis is the angle within an orbital plane from the ascending node to periapsis in the direction of motion.
It orients the orbit’s nearest point within its plane.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Also appears in
- Astronomy & Skywatching
- Aliases
- None listed
- Last updated
- 2026-07-16
Quick reference
- Use when
- Use it only with the associated node, reference plane, and element set.
- Do not use it for
- It becomes undefined for special circular or equatorial cases without alternate elements.
- Reference category
- Astronomy & Skywatching
- Related terms
- Orbital Inclination, Longitude of Ascending Node, True Anomaly, Mean Anomaly
The story behind Argument of Periapsis
The parameter emerged from classical methods for representing conic orbits.
Argument of Periapsis in spiritual tradition
Precise descriptions also admit where their coordinates break down.
The Great Almanac frames Argument of Periapsis with educational restraint. Mystical or symbolic language may be meaningful, but it should not be exaggerated into certainty, panic, or permission to ignore ordinary responsibility.
Argument of Periapsis in the Bible
This is a factual astronomy reference. It can support wonder at the created order without becoming a claim of fate, worship, or private revelation.
Argument of Periapsis in numerology
Argument of Periapsis 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 Argument of Periapsis matters
It completes the spatial orientation of an eccentric inclined orbit.
Example in a reading: Changing the argument rotates the ellipse inside an unchanged orbital plane.
Interpretive caution: It becomes undefined for special circular or equatorial cases without alternate elements.
How Argument of Periapsis is used in a reading
Use it only with the associated node, reference plane, and element set.
Where interpretation stops
Argument of Periapsis 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: Astronomical Almanac Glossary - Definitions for astronomical coordinates, time, reference systems, and observable phenomena.
- NASA Science: Orbits and Kepler’s Laws - NASA explanation of orbital ellipses, orbital periods, and Kepler’s laws of planetary motion.
The page starts with a direct definition, then separates use, example, caution, spiritual meaning, and historical context. For astrology, occult, demonology, curse, and spiritual warfare terms, the editorial rule is to explain the term without making fear-based, fatalistic, medical, legal, financial, or ritual-instruction claims.
Continue learning
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Open Worldwide WatchRelated terms
These related entries help place Argument of Periapsis inside a wider reference cluster instead of leaving it as a standalone keyword.
