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Lunisolar precession
(gcide) | Precession \Pre*ces"sion\, n. [L. praecedere, praecessum, to go
before: cf. F. pr['e]cession. See Precede.]
The act of going before, or forward.
[1913 Webster]
Lunisolar precession. (Astron.) See under Lunisolar.
Planetary precession, that part of the precession of the
equinoxes which depends on the action of the planets
alone.
Precession of the equinoxes (Astron.), the slow backward
motion of the equinoctial points along the ecliptic, at
the rate of 50.2[sec] annually, caused by the action of
the sun, moon, and planets, upon the protuberant matter
about the earth's equator, in connection with its diurnal
rotation; -- so called because either equinox, owing to
its westerly motion, comes to the meridian sooner each day
than the point it would have occupied without the motion
of precession, and thus precedes that point continually
with reference to the time of transit and motion.
[1913 Webster] |
Lunisolar precession
(gcide) | Lunisolar \Lu"ni*so"lar\, a. [L. luna moon + E. solar: cf. F.
lunisolaire.]
Resulting from the united action, or pertaining to the mutual
relations, of the sun and moon.
[1913 Webster]
Lunisolar precession (Astron.), that portion of the annual
precession of the equinoxes which depends on the joint
action of the sun and moon.
Lunisolar year, a period of time, at the end of which, in
the Julian calendar, the new and full moons and the
eclipses recur on the same days of the week and month and
year as in the previous period. It consists of 532 common
years, being the least common multiple of the numbers of
years in the cycle of the sun and the cycle of the moon.
[1913 Webster] |
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