Parallax \Par"al*lax\, n. [Gr. ? alternation, the mutual
inclination of two lines forming an angle, fr. ? to change a
little, go aside, deviate; para` beside, beyond + ? to
change: cf. F. parallaxe. Cf. Parallel.]
1. The apparent displacement, or difference of position, of
an object, as seen from two different stations, or points
of view.
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2. (Astron.) The apparent difference in position of a body
(as the sun, or a star) as seen from some point on the
earth's surface, and as seen from some other conventional
point, as the earth's center or the sun.
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3. (Astron.) The annual parallax. See annual parallax,
below.
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Annual parallax, the greatest value of the heliocentric
parallax, or the greatest annual apparent change of place
of a body as seen from the earth and sun; it is equivalent
to the parallax of an astronomical object which would be
observed by taking observations of the object at two
different points one astronomical unit (the distance of
the Earth from the sun) apart, if the line joining the two
observing points is perpendicular to the direction to the
observed object; as, the annual parallax of a fixed star.
The distance of an astronomical object from the Earth is
inversely proportional to the annual parallax. A star
which has an annual parallax of one second of an arc is
considered to be one parsec (3.26 light years) distant
from the earth; a star with an annual parallax of
one-hundredth second of an arc is 326 light years distant.
See parsec in the vocabulary, and stellar parallax,
below.
Binocular parallax, the apparent difference in position of
an object as seen separately by one eye, and then by the
other, the head remaining unmoved.
Diurnal parallax 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 parallax of a body with
reference to the sun, or the angle subtended at the body
by lines drawn from it to the earth and sun; as, the
heliocentric parallax of a planet.
Horizontal parallax, the geocentric parallx of a heavenly
body when in the horizon, or the angle subtended at the
body by the earth's radius.
Optical parallax, the apparent displacement in position
undergone by an object when viewed by either eye singly.
--Brande & C.
Parallax of the cross wires (of an optical instrument),
their apparent displacement when the eye changes its
position, caused by their not being exactly in the focus
of the object glass.
Stellar parallax, the annual parallax of a fixed star.
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Diurnal \Di*ur"nal\, a. [L. diurnalis, fr. dies day. See
Deity, and cf. Journal.]
1. Relating to the daytime; belonging to the period of
daylight, distinguished from the night; -- opposed to
nocturnal; as, diurnal heat; diurnal hours.
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2. 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.
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Ere twice the horses of the sun shall bring
Their fiery torcher his diurnal ring. --Shak.
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3. (Bot.) Opening during the day, and closing at night; --
said of flowers or leaves.
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4. (Zool.) Active by day; -- applied especially to the eagles
and hawks among raptorial birds, and to butterflies
(Diurna) among insects.
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Diurnal aberration (Anat.), the aberration of light arising
from the effect of the earth's rotation upon the apparent
direction of motion of light.
Diurnal arc, the arc described by the sun during the
daytime or while above the horizon; hence, the arc
described by the moon or a star from rising to setting.
Diurnal circle, the apparent circle described by a
celestial body in consequence of the earth's rotation.
Diurnal motion of the earth, the motion of the earth upon
its axis which is described in twenty-four hours.
Diurnal motion of a heavenly body, that apparent motion of
the heavenly body which is due to the earth's diurnal
motion.
Diurnal parallax. See under Parallax.
Diurnal revolution of a planet, the motion of the planet
upon its own axis which constitutes one complete
revolution.
Syn: See Daily.
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Diurnal parallax iDiurnal parallax iDurnal parallax DiDurnal parallax iurnal parallax DDiurnal parallax Duirnal parallax Diuirnal parallax Durnal parallax Diiurnal parallax Dirunal parallax Diurunal parallax Dirnal parallax Diuurnal parallax Diunral parallax Diurnral parallax Diunal parallax Diurrnal parallax Diuranl parallax Diurnanl parallax Diural parallax Diurnnal parallax Diurnla parallax Diurnala parallax Diurnl parallax Diurnaal parallax Diurna lparallax Diurnal lparallax Diurna parallax Diurnall parallax Diurnalp arallax Diurnal p arallax Diurnalparallax Diurnal parallax Diurnal aprallax Diurnal paprallax Diurnal arallax Diurnal pparallax Diurnal praallax Diurnal paraallax Diurnal prallax Diurnal paarallax Diurnal paarllax Diurnal pararllax Diurnal paallax Diurnal parrallax Diurnal parlalax Diurnal paralalax Diurnal parllax Diurnal paraallax Diurnal paralllax Diurnal paralax Diurnal paralllax Diurnal paralalx Diurnal parallalx Diurnal paralax Diurnal paralllax Diurnal parallxa Diurnal parallaxa Diurnal parallx Diurnal parallaax Diurnal parallxax Diurnal paralla Diurnal parallaxx wiurnal parallax dwiurnal parallax wdiurnal parallax eiurnal parallax deiurnal parallax ediurnal parallax riurnal parallax driurnal parallax rdiurnal parallax siurnal parallax dsiurnal parallax sdiurnal parallax fiurnal parallax dfiurnal parallax fdiurnal parallax xiurnal parallax dxiurnal parallax xdiurnal parallax ciurnal parallax dciurnal parallax cdiurnal parallax viurnal parallax dviurnal parallax vdiurnal parallax iurnal parallax d iurnal parallax diurnal parallax D8urnal parallax Di8urnal parallax D8iurnal parallax D*urnal parallax Di*urnal parallax D*iurnal parallax D9urnal parallax Di9urnal parallax D9iurnal parallax Duurnal parallax Diuurnal parallax Duiurnal parallax Dournal parallax Diournal parallax Doiurnal parallax Djurnal parallax Dijurnal parallax Djiurnal parallax Dkurnal parallax Dikurnal parallax Dkiurnal parallax Dlurnal parallax Dilurnal parallax Dliurnal parallax Daurnal parallax Deurnal parallax Di7rnal parallax Diu7rnal parallax Di7urnal parallax Di&rnal parallax Diu&rnal parallax Di&urnal parallax Di8rnal parallax Diu8rnal parallax Di8urnal parallax Diyrnal parallax Diuyrnal parallax Diyurnal parallax Diirnal parallax Diuirnal parallax Diiurnal parallax Dihrnal parallax Diuhrnal parallax Dihurnal parallax Dijrnal parallax Diujrnal parallax Dijurnal parallax Dikrnal parallax Diukrnal parallax Dikurnal parallax Diarnal parallax Diernal parallax Diornal parallax Diu4nal parallax Diur4nal parallax Diu4rnal parallax Diu$nal parallax Diur$nal parallax Diu$rnal parallax Diu5nal parallax Diur5nal parallax Diu5rnal parallax Diuenal parallax Diurenal parallax Diuernal parallax Diutnal parallax Diurtnal parallax Diutrnal parallax Diudnal parallax Diurdnal parallax Diudrnal parallax Diufnal parallax Diurfnal parallax Diufrnal parallax Diugnal parallax Diurgnal parallax Diugrnal parallax Diurgal parallax Diurngal parallax Diurgnal parallax Diurhal parallax Diurnhal parallax Diurhnal parallax Diurjal parallax Diurnjal parallax Diurjnal parallax Diurbal parallax Diurnbal parallax Diurbnal parallax Diurmal parallax Diurnmal parallax Diurmnal parallax Diur al parallax Diurn al parallax Diur nal parallax Diurnql parallax Diurnaql parallax Diurnqal parallax Diurnwl parallax Diurnawl parallax Diurnwal parallax Diurnsl parallax Diurnasl parallax Diurnsal parallax Diurnxl parallax Diurnaxl parallax Diurnxal parallax Diurnzl parallax Diurnazl parallax Diurnzal parallax Diurn l parallax Diurna l parallax Diurn al parallax Diurnel parallax Diurnil parallax Diurnol parallax Diurnul parallax Diurnai parallax Diurnali parallax Diurnail parallax Diurnao parallax Diurnalo parallax Diurnaol parallax Diurnap parallax Diurnalp parallax Diurnapl parallax Diurnak parallax Diurnalk parallax Diurnakl parallax Diurna, parallax Diurnal, parallax Diurna,l parallax Diurna. parallax Diurnal. parallax Diurna.l parallax Diurnal 0arallax Diurnal p0arallax Diurnal 0parallax Diurnal )arallax Diurnal p)arallax Diurnal )parallax Diurnal oarallax Diurnal poarallax Diurnal oparallax Diurnal larallax Diurnal plarallax Diurnal lparallax Diurnal pqrallax Diurnal paqrallax Diurnal pqarallax Diurnal pwrallax Diurnal pawrallax Diurnal pwarallax Diurnal psrallax Diurnal pasrallax Diurnal psarallax Diurnal pxrallax Diurnal paxrallax Diurnal pxarallax Diurnal pzrallax Diurnal pazrallax Diurnal pzarallax Diurnal p rallax Diurnal pa rallax Diurnal p arallax Diurnal perallax Diurnal pirallax Diurnal porallax Diurnal purallax Diurnal pa4allax Diurnal par4allax Diurnal pa4rallax Diurnal pa$allax Diurnal par$allax Diurnal pa$rallax Diurnal pa5allax Diurnal par5allax Diurnal pa5rallax Diurnal paeallax Diurnal pareallax Diurnal paerallax Diurnal patallax Diurnal partallax Diurnal patrallax Diurnal padallax Diurnal pardallax Diurnal padrallax Diurnal pafallax Diurnal parfallax Diurnal pafrallax Diurnal pagallax Diurnal pargallax Diurnal pagrallax Diurnal parqllax Diurnal paraqllax Diurnal parqallax Diurnal parwllax Diurnal parawllax Diurnal parwallax Diurnal parsllax Diurnal parasllax Diurnal parsallax Diurnal parxllax Diurnal paraxllax Diurnal parxallax Diurnal parzllax Diurnal parazllax Diurnal parzallax Diurnal par llax Diurnal para llax Diurnal par allax Diurnal parellax Diurnal parillax Diurnal parollax Diurnal parullax Diurnal paraiiax Diurnal paraliiax Diurnal paraiilax Diurnal paraooax Diurnal paralooax Diurnal paraoolax Diurnal parappax Diurnal paralppax Diurnal parapplax Diurnal parakkax Diurnal paralkkax Diurnal parakklax Diurnal para,,ax Diurnal paral,,ax Diurnal para,,lax Diurnal para..ax Diurnal paral..ax Diurnal para..lax Diurnal parallqx Diurnal parallaqx Diurnal parallqax Diurnal parallwx Diurnal parallawx Diurnal parallwax Diurnal parallsx Diurnal parallasx Diurnal parallsax Diurnal parallxx Diurnal parallaxx Diurnal parallxax Diurnal parallzx Diurnal parallazx Diurnal parallzax Diurnal parall x Diurnal paralla x Diurnal parall ax Diurnal parallex Diurnal parallix Diurnal parallox Diurnal parallux Diurnal parallaa Diurnal parallaxa Diurnal parallaax Diurnal parallas Diurnal parallaxs Diurnal parallasx Diurnal parallad Diurnal parallaxd Diurnal paralladx Diurnal parallaz Diurnal parallaxz Diurnal parallazx Diurnal parallac Diurnal parallaxc Diurnal parallacx Diurnal paralla Diurnal parallax Diurnal paralla x Definition commonly spelled as: Defanition or Defenition, Synonym as: Synonim, Sinonym or Sinonim, Thesaurus as: Thesorus or Thesauris, Dictionary as: Dictionery or Dictionry and Define is usually not misspelled. 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