The point in an orbit where the orbiting body crosses a reference plane,
such as the ecliptic or the celestial equator, going from south to north.
The celestial longitude of the ascending node is one of the elements of
the orbit. → descending node.

An electrode that performs electron multiplication by means of secondary emission.

From dyn(a)- a combining form meaning "power," → dynamics
+ -ode a combining form meaning "way, road," used in the formation of
compound words (anode; electrode), from Gk. hodos "way."

As above.

line of nodes

خط ِ گرهها

xatt-e gerehhâ (#)

Fr.: lignes des nœuds

The line created by the intersection of the equatorial plane and the orbital plane.

One of the → orbital elements
used to specify the orbit of an object in space. It is the
angle from the reference direction, called the origin of longitude, to
the direction of the → ascending node,
measured in the reference plane.

One of the two points of intersection of the orbit of the Moon with
the plane of → ecliptic.
Indeed, the lunar orbit is tilted by about 5 degrees relative to the ecliptic.
The revolution period of a lunar node in ecliptic is 18.61 years. Due to perturbation
by the Sun, the lunar nodes slowly regress westward by 19.3° per year.
See also → ascending node;
→ descending node.

The slow motion of the → nodes of the Moon's orbit in the
opposite direction to the Moon's movement. This westward motion, caused by perturbations
of other bodies, mainly the Earth and Sun, has a rate of 19.35 degrees per year,
making one rotation in 18.6 years.