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Dip of the horizon
(gcide) | Horizon \Ho*ri"zon\, n. [F., fr. L. horizon, fr. Gr. ? (sc. ?)
the bounding line, horizon, fr. ? to bound, fr. ? boundary,
limit.]
1. The line 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.
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And when the morning sun shall raise his car
Above the border of this horizon. --Shak.
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All the horizon round
Invested with bright rays. --Milton.
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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 horizon 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.
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3. (Geol.) The epoch or time during which a deposit was made.
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The strata all over the earth, which were formed at
the same time, are said to belong to the same
geological horizon. --Le Conte.
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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.
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5. The limit of a person's range of perception, capabilities,
or experience; as, children raised in the inner city have
limited horizons.
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6. [fig.] A boundary point or line, or a time point, beyond
which new knowledge or experiences may be found; as, more
powerful computers are just over the horizon.
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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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Dip of the horizon
(gcide) | Dip \Dip\, n.
1. The action of dipping or plunging for a moment into a
liquid. "The dip of oars in unison." --Glover.
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2. Inclination downward; direction below a horizontal line;
slope; pitch.
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3. a hollow or depression in a surface, especially in the
ground.
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4. A liquid, as a sauce or gravy, served at table with a
ladle or spoon. [Local, U.S.] --Bartlett.
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5. A dipped candle. [Colloq.] --Marryat.
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6. A gymnastic exercise on the parallel bars in which the
performer, resting on his hands, lets his arms bend and
his body sink until his chin is level with the bars, and
then raises himself by straightening his arms.
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7. In the turpentine industry, the viscid exudation, which is
dipped out from incisions in the trees; as, virgin dip
(the runnings of the first year), yellow dip (the runnings
of subsequent years).
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8. (A["e]ronautics) A sudden drop followed by a climb,
usually to avoid obstacles or as the result of getting
into an airhole.
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9. a liquid, in which objects are soaked by dipping; e.g., a
parasiticide or insecticide solution into which animals
are dipped (see sheep-dip).
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10. a sauce into which foods are dipped to enhance the
flavor; e. g., an onion dip made from sour cream and
dried onions, into which potato chips are dipped.
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11. a pickpocket. [slang]
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Dip of the horizon (Astron.), the angular depression of the
seen or visible horizon below the true or natural horizon;
the angle at the eye of an observer between a horizontal
line and a tangent drawn from the eye to the surface of
the ocean.
Dip of the needle, or Magnetic dip, the angle formed, in
a vertical plane, by a freely suspended magnetic needle,
or the line of magnetic force, with a horizontal line; --
called also inclination.
Dip of a stratum (Geol.), its greatest angle of inclination
to the horizon, or that of a line perpendicular to its
direction or strike; -- called also the pitch.
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