Dictionary term
Greatest Elongation
Direct answer
Greatest Elongation is the maximum apparent angular separation of Mercury or Venus from the Sun during one apparition.
It marks an inner planet’s widest solar separation.
It marks an inner planet’s widest solar separation.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.Quick reference
- Use when
- Distinguish eastern evening elongation from western morning elongation.
- Do not use it for
- Best visibility can occur on a nearby date because horizon angle and season also matter.
- Reference category
- Astronomy & Skywatching
- Related terms
- Phase Angle, Solar Elongation, Astronomical Opposition, Inferior Conjunction
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The story behind Greatest Elongation
Geometric models and ephemerides predicted inner-planet elongations for observers.
Greatest Elongation: 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.
Greatest Elongation in numerology
Greatest Elongation 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 Greatest Elongation matters
It often identifies a favorable observing window in evening or morning twilight.
Greatest Elongation at work: an example
Venus at greatest eastern elongation stands farthest east of the Sun in angle, not physical distance.
Where interpretation stops
Greatest Elongation 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: Skywatching FAQ - NASA guidance for observing stars, planets, constellations, and changing sky events.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Also appears in
- Astronomy & Skywatching
- Aliases
- None listed
- Last updated
- 2026-07-16
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More in Astronomy & Skywatching
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- Telescope Focal Length
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Common questions
What is Greatest Elongation?
Greatest Elongation is the maximum apparent angular separation of Mercury or Venus from the Sun during one apparition.
How is Greatest Elongation used in an almanac?
Distinguish eastern evening elongation from western morning elongation.
What should I avoid when interpreting Greatest Elongation?
Best visibility can occur on a nearby date because horizon angle and season also matter.
