ascending node

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Noun1.ascending node - the point at which an orbit crosses the ecliptic plane going north
node - (astronomy) a point where an orbit crosses a plane
descending node - the point at which an orbit crosses the ecliptic plane going south
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.
In fact, because of the regression of the Moon's orbital nodes, the exact lighting conditions repeat only every 18 years!