descending node

Thân thiện

The satellite passes through its descending node on the orbital diagram.

Definition

1. Noun:
   • The point in the orbit of a celestial body (such as the Moon or a planet) where it crosses the plane of the ecliptic (the apparent path of the Sun) moving from north to south. This is a specific term in astronomy and orbital mechanics.

Usage Examples

• Noun:
  • The spacecraft was timed to reach the descending node precisely at midnight.
  • Astronomers calculated the position of the Moon's descending node to predict the eclipse.

Advanced Usage

• "To cross the descending node": This phrase describes the moment a celestial body passes through this specific orbital point.
  • The comet will cross the descending node next week, entering the southern celestial hemisphere.

Variants and Related Words

• Ascending node (n): The opposite point where an orbit crosses the ecliptic plane going from south to north.
  • The difference between the positions of the ascending and descending nodes defines the orientation of the orbit.
• Node (n): The general term for either of the two points where an orbit intersects a reference plane.
  • The line connecting the two nodes is called the line of nodes.

Synonyms

• Southbound node: A less common descriptive synonym.
• Orbital node (southward crossing): A more detailed descriptive phrase.

Related Phrases

• Line of nodes: The straight line connecting the ascending and descending nodes.
  • The orientation of the line of nodes slowly changes over time due to gravitational perturbations.

Học thuật

Noun

1. the point at which an orbit crosses the ecliptic plane going south