Sky science
Ascending Orbital Node
Direct answer
Ascending Orbital Node: The Ascending Orbital Node is where an orbiting body crosses a reference plane from its negative to positive side.
It is the upward crossing of two orbital planes.
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At a glance
- Found in
- Astronomy & Skywatching
- Related
- Perigee, Apogee, Descending Orbital Node, Barycenter
It is the upward 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 Ascending Orbital Node
Nodes became standard elements for describing inclined planetary and lunar paths.
A one-minute story
The Wandering Stars
How the moving planets were watched, named and found, and what a transit is.
Why Ascending Orbital Node matters
Ascending Orbital Node helps define orbit orientation and eclipse or transit geometry.
How to read Ascending Orbital Node
Name the reference plane and avoid treating the node as a physical object.
Ascending Orbital Node in practice: an example
A lunar eclipse requires the full Moon to be sufficiently near a lunar node.
Where readings of Ascending Orbital Node go wrong
Ascending depends on the chosen coordinate side, not ordinary upward motion.
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
Mark the upward orbital crossing
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More in Astronomy & Skywatching
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Common questions
What is the Ascending Orbital Node?
The Ascending Orbital Node is where an orbiting body crosses a reference plane from its negative to positive side.
What do people get wrong about the Ascending Orbital Node?
Ascending depends on the chosen coordinate side, not ordinary upward motion.
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