The DICT Development Group
1 definition found
for Meridian instrument
From The Collaborative International Dictionary of English v.0.48 :
Meridian \Me*rid"i*an\, n. [F. m['e]ridien. See Meridian, a.]
1. Midday; noon.
2. Hence: The highest point, as of success, prosperity, or
the like; culmination.
I have touched the highest point of all my
And from that full meridian of my glory
I haste now to my setting. --Shak.
3. (Astron.) A great circle of the sphere passing through the
poles of the heavens and the zenith of a given place. It
is crossed by the sun at midday.
4. (Geog.) A great circle on the surface of the earth,
passing through the poles and any given place; also, the
half of such a circle included between the poles.
Note: The planes of the geographical and astronomical
meridians coincide. Meridians, on a map or globe, are
lines drawn at certain intervals due north and south,
or in the direction of the poles.
Calculated for the meridian of, or fitted to the meridian
of, or adapted to the meridian of, suited to the local
circumstances, capabilities, or special requirements of.
All other knowledge merely serves the concerns of
this life, and is fitted to the meridian thereof.
--Sir M. Hale.
First meridian or prime meridian, the meridian from which
longitudes are reckoned. The meridian of Greenwich is the
one commonly employed in calculations of longitude by
geographers, and in actual practice, although in various
countries other and different meridians, chiefly those
which pass through the capitals of the countries, are
occasionally used; as, in France, the meridian of Paris;
in the United States, the meridian of Washington, etc.
Guide meridian (Public Land Survey), a line, marked by
monuments, running North and South through a section of
country between other more carefully established meridians
called principal meridians, used for reference in
Magnetic meridian, a great circle, passing through the
zenith and coinciding in direction with the magnetic
needle, or a line on the earth's surface having the same
Meridian circle (Astron.), an instrument consisting of a
telescope attached to a large graduated circle and so
mounted that the telescope revolves like the transit
instrument in a meridian plane. By it the right ascension
and the declination of a star may be measured in a single
Meridian instrument (Astron.), any astronomical instrument
having a telescope that rotates in a meridian plane.
Meridian of a globe, or Brass meridian, a graduated
circular ring of brass, in which the artificial globe is
suspended and revolves.
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