An → electrode from which a stream of → electrons leaves, as in an electron tube or electrolytic cell. → cathode.
From Gk. anodos "way up," from → ana- "up" + hodos "way."
Ânod, loanword from anode as above.
pâdgereh (#), šekam (#)
The position of maximum → amplitude midway between two adjacent → nodes in a → standing wave.
Fr.: nœud ascendant
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.
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.
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."
line of nodes
xatt-e gerehhâ (#)
Fr.: lignes des nœuds
The line created by the intersection of the equatorial plane and the orbital plane.
longitude of ascending node
derežnâ-ye gereh-e farâzeši
Fr.: longitude du nœud ascendant
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.
→ longitude; → ascending node.
gereh (#), gowzahr (#)
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.
Gereh, → node; gowzahri, related to gowzahr, → draconic month.
lunar orbit node
gereh-e madâri-ye mâh
Fr.: nœud de l'orbite lunaire
Same as → lunar node.
1) A point of zero → amplitude in a system of
→ stationary waves. See also
From L. nodus "knot;" cognate with necto "I bind," Skt. nahyati "binds, ties," Av. naska-, "bundle," Old Irish nascim "to bind," Old Norse knutr, Norwegian knut, Icelandic hnutur, O.E. cnotta, Modern E. knot, O.H.G. knotto, Ger. Knoten; PIE root *ned- "to bind, tie."
Gereh "knot," from Mid.Pers. grih "knot;" Sogdian γr'nš "knot, bond, joining;" Khotanese grantha- "knot;" cf. Skt. granthi- "knot."
Fr.: nœud orbital
One of the two points of intersection of the orbit of a secondary body with the plane of reference through the primary.
precession of the nodes
Fr.: précession des nœuds
The gradual change in he orbital planes of a binary system.
→ precession; → node.
regression of the nodes
pasraft-e gerehhâ , ~ gowzahrhâ
Fr.: régression des noeuds
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.
→ regression; → node.