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(), 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 t スポンサード リンク
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