orbital node

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orbital node

[′ȯr·bəd·əl ′nōd]
(astronomy)
One of the two points at which the orbit of a planet or satellite crosses the plane of the ecliptic or equator.
References in periodicals archive ?
The type and length of an eclipse depend upon the Moon's location relative to its orbital nodes. Unlike a solar eclipse, which can only be viewed from a certain relatively small area of the world, a lunar eclipse may be viewed from anywhere on the night side of the Earth.
Figure 2 presents time evolution of the mean orbital elements and the mean position of the ascending and descending nodes orbital nodes of the 21 VAs of the asteroid (101955) Bennu 5000 yr backwards and 1000 yr forward from the osculating epoch 2014 May 23.0 = JDT 2456800.5.
Time Evolution of the Orbital Nodes. In Figure 2 we can see that the mean longitude of the ascending node, [OMEGA], changes slowly its value from about 77[degrees] 5000 yr ago to 349[degrees] 1000 yr in the future, that is, changing its value with velocity of about -52.8"/yr.
Figure 3 presents value of orbital elements and position of the orbital nodes, of 1201 VAs of the asteroid (101955) Bennu after 5000 yr backwards evolution (triangles) and 1000 yr in the future (crosses).
In fact, because of the regression of the Moon's orbital nodes, the exact lighting conditions repeat only every 18 years!