An Etymological Dictionary of Astronomy and Astrophysics

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory



Number of Results: 13 Search : node
ânod (#)

Fr.: anode   

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.

  پاد-گره، شکم   
pâdgereh (#), šekam (#)

Fr.: anti-nœud   

The position of maximum → amplitude midway between two adjacent → nodes in a → standing wave.

anti-; → node.

ascending node
  گره ِ فرازشی   
gereh-e farâzeši

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.

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."

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.

line, → node.

longitude of ascending node
  درژنای ِ گره ِ فرازشی   
derežnâ-ye gereh-e farâzeši

Fr.: longitude du nœ ud 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.

lunar node
  گره، گوزهر   
gereh (#), gowzahr (#)

Fr.: nœud   

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.

lunar; → node.

Gereh, → node; gowzahri, related to gowzahr, → draconic month.

lunar orbit node
  گره ِ مداری ِ ماه   
gereh-e madâri-ye mâh

Fr.: nœud de l'orbite lunaire   

Same as → lunar node.

lunar; → orbit; → node.

gereh (#)

Fr.: nœud   

1) A point of zero → amplitude in a system of → stationary waves. See also → antinode.
2) A → junction point in a network.
3) Same as → orbital node; see also → lunar node.
4) In → graph theory, same as → vertex.

From L. nodus "knot."

Gereh "knot," from Mid.Pers. grih "knot;" Sogdian γr'nš "knot, bond, joining;" Khotanese grantha- "knot;" cf. Skt. granthi- "knot."

orbital node
  گره ِ مداری   
gereh-e madâri

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.

orbital; → node.

precession of the nodes
  پیشایان ِ گره‌ها   
pišâyân-e gereh-hâ

Fr.: précession des nœuds   

The gradual change in he orbital planes of a binary system.

precession; → node.

regression of the nodes
  پسرفت ِ گره‌ها، ~ گوزهرها   
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.