Dictionary term
Synodic Period
Direct answer
Synodic Period: A Synodic Period is the interval between repeated alignments of two orbiting bodies as seen from a chosen observer.
It measures the recurrence of an apparent configuration.
It measures the recurrence of an apparent configuration.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.Quick reference
- Use when
- Name both bodies and the observer’s frame.
- Do not use it for
- A synodic period is not the body’s period around its primary.
- Reference category
- Astronomy & Skywatching
- Related terms
- Orbital Period, Sidereal Period, Periapsis, Apoapsis
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The story behind Synodic Period
Synodic cycles were fundamental to early planetary and lunar calendars.
Synodic Period in spiritual tradition
Relationship creates rhythms not possessed by either orbit alone.
Synodic Period: fact and faith, kept distinct
This is a factual astronomy reference. It can support wonder at the created order without becoming a claim of fate, worship, or private revelation.
Synodic Period in numerology
Synodic Period 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 Synodic Period matters
It explains intervals between oppositions, conjunctions, or like lunar phases.
Synodic Period at work: an example
Mars returns to opposition on a synodic schedule longer than one Earth year.
Where interpretation stops
Synodic Period 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:
- NASA Science: Orbits and Kepler’s Laws - NASA explanation of orbital ellipses, orbital periods, and Kepler’s laws of planetary motion.
- U.S. Naval Observatory: Astronomical Almanac Glossary - Definitions for astronomical coordinates, time, reference systems, and observable phenomena.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Also appears in
- Astronomy & Skywatching
- Aliases
- None listed
- Last updated
- 2026-07-16
Compare sidereal and synodic cycles
Synodic Period in a book is one thing; Synodic Period 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 Astronomy & Skywatching
- Angular Separation
- Atmospheric Transparency
- Descending Orbital Node
- Gravitational Lensing
- Local Meridian
- Orbital Perturbation
- Quasar
- Small Circle
Common questions
What is Synodic Period?
A Synodic Period is the interval between repeated alignments of two orbiting bodies as seen from a chosen observer.
How is Synodic Period used in an almanac?
Name both bodies and the observer’s frame.
What should I avoid when interpreting Synodic Period?
A synodic period is not the body’s period around its primary.
