line of nodes


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Related to line of nodes: descending node

line of nodes

See nodes.

Line of Nodes

 

in astronomy, the line along which the orbital plane of a celestial body intersects the principal plane passing through the primary. The plane of the ecliptic is taken as the principal plane in the study of the motion of the planets, comets, and other bodies of the solar system, and the equatorial plane of the earth is usually taken as the principal plane in the study of the motion of the moon and artificial earth satellites. The points of intersection of the line of nodes with the celestial sphere, whose center is at the primary, are called the nodes of the orbit.

References in periodicals archive ?
At high magnetic fields the temperature dependence of thermal conductivity is compatible with the presence of a line of nodes in the superconducting gap as reported in the parent system URhGe.
The orbital planes cross each other at a line of nodes resulting in at least two, and up to five, solar eclipses occurring each year; no more than two of which can be total eclipses.However, total solar eclipses are rare at any particular location because totality exists only along a narrow path on Earth's surface traced by the Moon's shadow or umbra.
Simultaneous close groupings of all five lines (Earth-Moon, Earth-Sun, major axis of the Moon's orbit, lunar line of nodes, major axis of Earth's orbit) did not occur at all in the 20th century, because two of these lines currently can coincide only in September, while another pair can align only in early January.