See also:angle which the terrestrial meridian from the
See also:pole through a point on the
See also:surface makes with some standard meridian, commonly that of
See also:Greenwich . It is equal to the difference between
See also:time on the standard meridian, and at the place defined, one
See also:hour of time corresponding to 15° difference of longitude . Formerly each nation took its own capital or
See also:observatory as the standard meridian from which longitudes were measured . Another
See also:system had a meridian passing through or near the
See also:island of Ferro, defined as 20 W. of
See also:Paris, as the standard . While the system of counting from the capital of the
See also:country is still used for local purposes, the tendency in
See also:recent years is to use the meridian of Greenwich for nautical and
See also:international purposes . France, however, uses the meridian of the Paris observatory as its standard for all nautical and astronomical purposes (see TIME) . In astronomy, the longitude of a
See also:body is the distance of its
See also:projection upon the
See also:ecliptic from the vernal equinox, counted in the direction west to east from o° to 36o° .
CASSIUS LONGINUS (c. A.D. 213-273)
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