(d) A radius vector, the angle which it makes
with a fixed plane, and the angle which its projection on the
plane makes with a fixed line line in the plane, by which means
any point in space at the free extremity of the radius vector is
referred to that fixed plane and fixed line, and a fixed point in
that line, the pole of the radius vector.
Cartesian coördinates.
See under
Cartesian. --
Geographical
coördinates,
the latitude and longitude of a
place, by which its relative situation on the globe is known. The
height of the above the sea level constitutes a third
coördinate. --
Polar
coördinates,
coördinates made up of a
radius vector and its angle of inclination to another line, or a
line and plane; as those defined in (b) and
(d) above. --
Rectangular
coördinates,
coördinates the axes of
which intersect at right angles. --
Rectilinear
coördinates,
coördinates made up of right
lines. Those defined in (a) and
(c) above are called also Cartesian
coördinates. --
Trigonometricalor
Spherical coördinates,
elements of
reference, by means of which the position of a point on the
surface of a sphere may be determined with respect to two great
circles of the sphere.
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