Definition of Equinactial
E`qui*noc"tial (?), a. [L.
aequinoctials, fr. aequinoctium equinox: cf. F.
équinoxial. See Equinox.] 1.
Pertaining to an equinox, or the equinoxes, or to the time of
equal day and night; as, the equinoctial line.
2. Pertaining to the regions or climate of
the equinoctial line or equator; in or near that line; as,
equinoctial heat; an equinoctial sun.
3. Pertaining to the time when the sun enters
the equinoctial points; as, an equinoctial gale or storm, that
is, one happening at or near the time of the equinox, in any part of
the world.
Equinoctial colure (Astron.), the
meridian passing through the equinoctial points. --
Equinoctial line (Astron.), the
celestial equator; -- so called because when the sun is on it, the
nights and days are of equal length in all parts of the world. See
Equator.
Thrice the equinoctial line
He circled. Milton.
-- Equinoctial points (Astron.), the
two points where the celestial and ecliptic intersect each other; the
one being in the first point of Aries, the other in the first point
of Libra. -- Equinoctial time (Astron.)
reckoned in any year from the instant when the mean sun is at the
mean vernal equinoctial point.
E`qui*noc"tial, n. The equinoctial
line.
- Webster's Unabridged Dictionary (1913)
- of, or relating to an equinox
- of, or relating to the celestial or terrestrial equator
- the great circle midway between the celestial poles; the celestial equator
- The Nuttall Encyclopedia
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