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apparent horizon definitions

WordNet (r) 3.0 (2005)

n
1: the line at which the sky and Earth appear to meet [syn: horizon, apparent horizon, visible horizon, sensible horizon, skyline]

U.S. Military Dictionary

(*) The visible line of demarcation between land/sea and sky.

Webster's 1913 Dictionary

Apparent Ap*par"ent, a. [F. apparent, L. apparens, -entis, p. pr. of apparere. See Appear.] 1. Capable of being seen, or easily seen; open to view; visible to the eye; within sight or view. The moon . . . apparent queen. --Milton. 2. Clear or manifest to the understanding; plain; evident; obvious; known; palpable; indubitable. It is apparent foul play. --Shak. 3. Appearing to the eye or mind (distinguished from, but not necessarily opposed to, true or real); seeming; as the apparent motion or diameter of the sun. To live on terms of civility, and even of apparent friendship. --Macaulay. What Berkeley calls visible magnitude was by astronomers called apparent magnitude. --Reid. Apparent horizon, the circle which in a level plain bounds our view, and is formed by the apparent meeting of the earth and heavens, as distinguished from the rational horizon. Apparent time. See Time. Heir apparent (Law), one whose to an estate is indefeasible if he survives the ancestor; -- in distinction from presumptive heir. See Presumptive. Syn: Visible; distinct; plain; obvious; clear; certain; evident; manifest; indubitable; notorious.

Webster's 1913 Dictionary

Horizon Ho*ri"zon, n. [F., fr. L. horizon, fr. Gr. ? (sc. ?) the bounding line, horizon, fr. ? to bound, fr. ? boundary, limit.] 1. The circle which bounds that part of the earth's surface visible to a spectator from a given point; the apparent junction of the earth and sky. And when the morning sun shall raise his car Above the border of this horizon. --Shak. All the horizon round Invested with bright rays. --Milton. 2. (Astron.) (a) A plane passing through the eye of the spectator and at right angles to the vertical at a given place; a plane tangent to the earth's surface at that place; called distinctively the sensible horizon. (b) A plane parallel to the sensible horizon of a place, and passing through the earth's center; -- called also rational or celestial horizon. (c) (Naut.) The unbroken line separating sky and water, as seen by an eye at a given elevation, no land being visible. 3. (Geol.) The epoch or time during which a deposit was made. The strata all over the earth, which were formed at the same time, are said to belong to the same geological horizon. --Le Conte. 4. (Painting) The chief horizontal line in a picture of any sort, which determines in the picture the height of the eye of the spectator; in an extended landscape, the representation of the natural horizon corresponds with this line. Apparent horizon. See under Apparent. Artificial horizon, a level mirror, as the surface of mercury in a shallow vessel, or a plane reflector adjusted to the true level artificially; -- used chiefly with the sextant for observing the double altitude of a celestial body. Celestial horizon. (Astron.) See def. 2, above. Dip of the horizon (Astron.), the vertical angle between the sensible horizon and a line to the visible horizon, the latter always being below the former. Rational horizon, and Sensible horizon. (Astron.) See def. 2, above. Visible horizon. See definitions 1 and 2, above.



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