evection

e·vec·tion

E0249000 (ĭ-vĕk′shən)n. Solar perturbation of the lunar orbit.

[Latin ēvectiō, ēvectiōn-, a going up, from ēvectus, past participle of ēvehere, to raise up : ē-, ex-, up from; see ex- + vehere, to carry; see wegh- in Indo-European roots.]

e·vec′tion·al adj.

evection

(ɪˈvɛkʃən) n (Astronomy) irregularity in the moon's motion caused by perturbations of the sun and planets[C17: from Latin ēvectiō a going up, from ēvehere to lead forth, from vehere to carry] eˈvectional adj

evection

Irregularity in the movement of the Moon caused by variations in the orbit of the Sun.

evection

(i-vek -shŏn) The periodic (31.807 day) inequality in the motion of the Moon that may amount to a displacement in longitude of up to 1°16′20″.4. It arises from changes in the eccentricity of the Moon's orbit (0.0432 to 0.0666) that are brought about by solar attraction. Evection was discovered by the Greek astronomer Hipparchus. See also annual equation; equation of center; parallactic inequality; variation.

Evection

the greatest disparity—that is, deviation from motion according to Kepler’s laws—in the moon’s motion around the earth, caused by perturbation by the sun. Discovered by Hip-parchus in the second century B.C., evection was detected by Ptolemy in the second century A.D. and was correctly explained by I. Newton. The change in the moon’s longitude owing to evection reaches 1°16’26” and varies with a period of approximately 31.8 mean solar days. The perturbing force that causes evection also changes the horizontal parallax of the moon periodically.

evection

[ē′vek·shən] (astrophysics) A perturbation of the moon in its orbit due to the attraction of the sun.

单词	evection
释义	evection e·vec·tion E0249000 (ĭ-vĕk′shən)n. Solar perturbation of the lunar orbit. [Latin ēvectiō, ēvectiōn-, a going up, from ēvectus, past participle of ēvehere, to raise up : ē-, ex-, up from; see ex- + vehere, to carry; see wegh- in Indo-European roots.] e·vec′tion·al adj. evection (ɪˈvɛkʃən) n (Astronomy) irregularity in the moon's motion caused by perturbations of the sun and planets[C17: from Latin ēvectiō a going up, from ēvehere to lead forth, from vehere to carry] eˈvectional adj evection Irregularity in the movement of the Moon caused by variations in the orbit of the Sun. evection evection (i-vek -shŏn) The periodic (31.807 day) inequality in the motion of the Moon that may amount to a displacement in longitude of up to 1°16′20″.4. It arises from changes in the eccentricity of the Moon's orbit (0.0432 to 0.0666) that are brought about by solar attraction. Evection was discovered by the Greek astronomer Hipparchus. See also annual equation; equation of center; parallactic inequality; variation. Evection the greatest disparity—that is, deviation from motion according to Kepler’s laws—in the moon’s motion around the earth, caused by perturbation by the sun. Discovered by Hip-parchus in the second century B.C., evection was detected by Ptolemy in the second century A.D. and was correctly explained by I. Newton. The change in the moon’s longitude owing to evection reaches 1°16’26” and varies with a period of approximately 31.8 mean solar days. The perturbing force that causes evection also changes the horizontal parallax of the moon periodically. evection [ē′vek·shən] (astrophysics) A perturbation of the moon in its orbit due to the attraction of the sun.
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