Sky science
True Anomaly
Direct answer
True Anomaly is the angle at the orbit’s focus from periapsis to the body’s current radius vector.
It gives actual angular position along a Keplerian orbit.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Longitude of Ascending Node, Argument of Periapsis, Mean Anomaly, Eccentric Anomaly
It gives actual angular position along a Keplerian orbit.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.
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The story behind True Anomaly
Keplerian geometry distinguished the body’s real angle from computational auxiliary anomalies.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why True Anomaly matters
True Anomaly connects an orbital element set with the body’s geometric location.
Where readings of True Anomaly go wrong
Equal changes in true anomaly generally do not take equal times.
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
- Last updated
- 2026-09-26
Locate a body from periapsis
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More in Astronomy & Skywatching
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Common questions
What is true anomaly?
True Anomaly is the angle at the orbit’s focus from periapsis to the body’s current radius vector.
What do people get wrong about true anomaly?
Equal changes in true anomaly generally do not take equal times.
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