Sky science
Descending Orbital Node
Direct answer
Descending Orbital Node: The Descending Orbital Node is where an orbiting body crosses a reference plane from its positive to negative side.
It is the downward crossing of two orbital planes.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Apogee, Ascending Orbital Node, Barycenter, Center of Mass Orbit
It is the downward crossing of two orbital planes.
A scientific orientation to scale, light, or motion; the article supplies the precise definition.
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The story behind Descending Orbital Node
Classical astronomy tracked descending nodes for eclipse prediction and orbit determination.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Descending Orbital Node matters
Together with the ascending node it defines the orbit’s line of nodes.
Descending Orbital Node in practice: an example
A body can pass the descending node while continuing smoothly along its three-dimensional orbit.
Where readings of Descending Orbital Node go wrong
The word descending does not necessarily mean moving toward a local horizon.
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.
- Source
- The Great Almanac Dictionary
- Category
- Astronomy & Skywatching
- Last updated
- 2026-09-26
Trace the second node crossing
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More in Astronomy & Skywatching
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Common questions
What is the Descending Orbital Node?
The Descending Orbital Node is where an orbiting body crosses a reference plane from its positive to negative side.
What do people get wrong about the Descending Orbital Node?
The word descending does not necessarily mean moving toward a local horizon.
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