Found 2 items, similar to Apparent horizon.
English → English
Definition: apparent horizon
n : the line at which the sky and Earth appear to meet [syn: horizon
, sensible horizon
English → English
Definition: Apparent horizon
, n. [F., fr. L. horizon, fr. Gr. ? (sc. ?)
the bounding line, horizon, fr. ? to bound, fr. ? boundary,
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.
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.
(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
or celestial horizon
(c) (Naut.) The unbroken line separating sky and water, as
seen by an eye at a given elevation, no land being
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
5. The limit of a person's range of perception, capabilities,
or experience; as, children raised in the inner city have
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.
. See under Apparent
, 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
. (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.
, and Sensible horizon
. (Astron.) See
def. 2, above.
. See definitions 1 and 2, above.
, 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
What Berkeley calls visible magnitude was by
astronomers called apparent magnitude. --Reid.
, 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
. See Time
(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.