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to the spectator, causing the alternate appearance and disappearance of either pole. (c) Diurnal or parallactic libration, that which brings into view on the upper limb, at rising and setting, some parts not in the average visible hemisphere.

izon, 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.

o, midday; belonging to, or passing through, the highest point attained by the sun in his diurnal course. "Meridian hour." Milton. Tables ... to find the altitude meridian. Chaucer.

curing in, the night; as, nocturnal darkness, cries, expedition, etc.; -- opposed to Ant: diurnal. Dryden.

ect as seen separately by one eye, and then by the other, the head remaining unmoved. -- Diurnal, or Geocentric, parallax, the parallax of a body with reference to the earth's center. This is the kind of parallax that is generally understood when the term is used without qualification. -- Heliocentric parallax, the p…

nd 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 contin…

f the West Indies and South America. Their bright colored and tailed hind wings and their diurnal flight cause them to closely resemble butterflies.