The descending node is the point where an orbiting body crosses the celestial equator from north to south. It is a crucial element in orbital mechanics, used to define the orientation of an orbit with respect to a reference plane, typically the equatorial plane of the primary body being orbited.

Descending Node

descending node

orbiting body

The celestial equator is an imaginary circle on the celestial sphere that is the projection of Earth's equator into space, equidistant from the celestial poles. It is fundamental in celestial navigation and astronomy, serving as a reference point for the equatorial coordinate system used to locate celestial objects.

celestial equator

north to south

Orbital mechanics, also known as celestial mechanics, is the study of the motions of artificial and natural celestial bodies under the influence of gravitational forces. It is fundamental for understanding satellite trajectories, space mission planning, and the dynamics of planetary systems.

orbital mechanics

orientation of an orbit

reference plane

The equatorial plane is an imaginary plane that is perpendicular to the axis of rotation of a rotating body, such as a planet, and divides it into two equal hemispheres. It is crucial in celestial mechanics and astronomy for understanding the orientation and movement of celestial bodies in space.

Relevant Degrees

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