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Diurnal :: Diurnal (a.) Active by day; -- applied especially to the eagles and hawks among raptorial birds, and to butterflies (Diurna) among insects..

Diurna :: Diurna (n. pl.) A division of Lepidoptera, including the butterflies; -- so called because they fly only in the daytime..

Diurnal :: Diurnal (a.) A small volume containing the daily service for the little hours, viz., prime, tierce, sext, nones, vespers, and compline..

Diurnally :: Diurnally (adv.) Daily; every day.

Heliostat :: Heliostat (n.) An instrument consisting of a mirror moved by clockwork, by which a sunbeam is made apparently stationary, by being steadily directed to one spot during the whole of its diurnal period; also, a geodetic heliotrope..

Diurnalness :: Diurnalness (n.) The quality of being diurnal.

Butterfly :: Butterfly (n.) A general name for the numerous species of diurnal Lepidoptera.

Low :: Low (adv.) In a path near the equator, so that the declination is small, or near the horizon, so that the altitude is small; -- said of the heavenly bodies with reference to the diurnal revolution; as, the moon runs low, that is, is comparatively near the horizon when on or near the meridian..

Diurnal :: Diurnal (a.) Relating to the daytime; belonging to the period of daylight, distinguished from the night; -- opposed to nocturnal; as, diurnal heat; diurnal hours..

Diurnal :: Diurnal (a.) Daily; recurring every day; performed in a day; going through its changes in a day; constituting the measure of a day; as, a diurnal fever; a diurnal task; diurnal aberration, or diurnal parallax; the diurnal revolution of the earth..

Semidiurnal :: Semidiurnal (a.) Pertaining to, or accomplished in, half a day, or twelve hours; occurring twice every day..

Urania :: Urania (n.) A genus of large, brilliantly colored moths native of the West Indies and South America. Their bright colored and tailed hind wings and their diurnal flight cause them to closely resemble butterflies..

Semidiurnal :: Semidiurnal (a.) Pertaining to, or traversed in, six hours, or in half the time between the rising and setting of a heavenly body; as, a semidiurnal arc..

Meridian :: Meridian (a.) Being at, or pertaining to, midday; belonging to, or passing through, the highest point attained by the sun in his diurnal course..

Aberration :: Aberration (n.) A small periodical change of position in the stars and other heavenly bodies, due to the combined effect of the motion of light and the motion of the observer; called annual aberration, when the observer's motion is that of the earth in its orbit, and daily or diurnal aberration, when of the earth on its axis; amounting when greatest, in the former case, to 20.4'', and in the latter, to 0.3''. Planetary aberration is that due to the motion of light and the motion of the planet re

Equidiurnal :: Equidiurnal (a.) Pertaining to the time of equal day and night; -- applied to the equinoctial line.

Diurnal :: Diurnal (a.) A diurnal bird or insect.

Diurnal :: Diurnal (a.) A daybook; a journal.

Diurnation :: Diurnation (n.) The condition of sleeping or becoming dormant by day, as is the case of the bats..

Arc :: Arc (n.) The apparent arc described, above or below the horizon, by the sun or other celestial body. The diurnal arc is described during the daytime, the nocturnal arc during the night..

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