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单词 sensible horizon
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sensible horizon
sensible horizon n. a circle bounding that part of the earth's surface which is visible from a given point of observation; (also) a circle of the celestial sphere formed by the intersection of the celestial sphere and a plane that passes through a given point of observation; cf. horizon n. 1a.The plane that passes through a given point of observation and intersects with the celestial sphere so as to form a sensible horizon will be perpendicular to that point of observation's zenith-nadir line and tangential to the earth's surface.
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1550 W. Salesbury tr. Proclus Descr. Sphere sig. D.iv And there be .ii. Horizons, one sensyble, the other ymagyned by vnderstandynge. The sensyble Horizon is that, whiche of oure syght is lymyted at the vtmoste of our..kennynge.
1642 J. Milton Apol. Smectymnuus 46 The rationall horizon in heav'n is but one, and the sensible horizons in earth are innumerable.
1764 J. Ferguson Lect. Select Subj. viii. 156 The sensible horizon is that circle, which a man standing upon a large plane, observes to terminate his view all around, where the heaven and earth seem to meet.
1860 Glasgow Herald 4 July 5/1 Its [sc. a comet] position, as nearly as I could guess, without actual measurement, was..14° above the sensible horizon, and dipping towards the sea.
1945 Proc. Amer. Philos. Soc. 89 5/2 In the latitude of East Base the sun is below the sensible horizon at noon from late May until mid-July.
2007 A. Sofaer in S. H. Lekson Archit. Chaco Canyon, New Mexico (2008) ix. 234/1 The orientations of eleven of the fourteen major buildings are associated with one of the four solar or lunar azimuths on the sensible horizon.
extracted from sensibleadj.n.adv.
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