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.

Ascending, from ascend, from L. ascendere
"to climb up," from ad- "to" + scandere "to climb."
Node, from L. nodus "knot".

Gereh "knot," from Mid.Pers. grih "knot."
Farâzeši, relating to farâzeš "ascension,"
from farâzidan "to ascend," from farâz "up, upon, upward,
aloft."

descending node

گره ِ فرودشی

gereh-e forudeši

Fr.: nœud descendant

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

Descending, from descend, from L. descendere "to go down,"
from → de- "down" + scandere "to climb;" Node, from
L. nodus "knot."

Gereh "knot," from Mid.Pers. grih "knot." Forudeši
adj. of forudeš, verbal noun of forudidan "to descend, go down,"
(Mid.Pers. frôtihitan "to descend"), from forud "down, downward,"
Mid.Pers. frôt "down, downward,"
O.Pers. fravata "forward, downward," Skt. pravát- "a sloping path,
the slope of a mountain."

dynode

دینود

dinod (#)

Fr.: dynode

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.