Found 1 items, similar to Rational horizon.
English → English
Definition: Rational 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.
(r[a^]sh"[u^]n*al), a. [L. rationalis: cf.
F. rationnel. See Ratio
, and cf. Rationale
1. Relating to the reason; not physical; mental.
Moral philosophy was his chiefest end; for the
rational, the natural, and mathematics . . . were
but simple pastimes in comparison of the other.
2. Having reason, or the faculty of reasoning; endowed with
reason or understanding; reasoning.
It is our glory and happiness to have a rational
3. Agreeable to reason; not absurd, preposterous,
extravagant, foolish, fanciful, or the like; wise;
judicious; as, rational conduct; a rational man.
4. (Chem.) Expressing the type, structure, relations, and
reactions of a compound; graphic; -- said of formul[ae].
See under Formula
. (Astron.) See Horizon
(Alg.), one that can be expressed without
the use of a radical sign, or in exact parts of unity; --
opposed to irrational
or radical quantity
(Med.), one elicited by the statements of
the patient himself and not as the result of a physical
Syn: Sane; sound; intelligent; reasonable; sensible; wise;
. Rational has reference to
reason as a faculty of the mind, and is opposed to
irrational; as, a rational being, a rational state of
mind, rational views, etc. In these cases the
speculative reason is more particularly, referred to.
Reasonable has reference to the exercise of this
faculty for practical purposes, and means, governed or
directed by reason; as, reasonable desires or plans; a
reasonable charge; a reasonable prospect of success.
What higher in her society thou find'st
Attractive, human, rational, love still.
A law may be reasonable in itself, although a
man does not allow it, or does not know the
reason of the lawgivers. --Swift.