DECLINATION (from Lat. declinare, to decline)

This article appears in Volume V07, Page 914 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: DAH-DEM

DECLINATION (from Lat. declinare, to decline) , in magnetism the

angle

ANGLE (from the Lat. angulus, a corner, a diminutive, of which the primitive form,
angus
- ANGUS, EARLS OF
, does not occur in Latin; cognate are the Lat. angere, to compress into a bend or to strangle, and the Gr. ayKOS, a bend; both connected with the Aryan root ank-, to

between true north and magnetic north, i.e. the variation between the true

meridian

and the magnetic

meridian

. In 1596 at London the

angle

ANGLE (from the Lat. angulus, a corner, a diminutive, of which the primitive form,
angus
- ANGUS, EARLS OF
, does not occur in Latin; cognate are the Lat. angere, to compress into a bend or to strangle, and the Gr. ayKOS, a bend; both connected with the Aryan root ank-, to

of declination was 11 E. of N., in 1652 magnetic north was true north, in 1815 the magnetic needle pointed 241 W. of N., in 1891 18 W., in 1896 17 56' W. and in 1906 17 45'. The angle is gradually diminishing and the declination will in time again be o, when it will slowly increase in an easterly direction, the north magnetic

pole

oscillating slowly around the North

Pole

Regular

REGULAR

daily changes of declination also occur. Magnetic storms cause irregular variations sometimes of one or two degrees. (See MAGNETISM, TERRESTRIAL.)
In astronomy the declination is the angular distance, as seen from the earth, of a heavenly

body

BODY

from the

celestial

CELESTIAL, OR STELLAR

equator

EQUATOR (
Late
- LATE
Lat. aequator, from aequare, to make equal)

, thus corresponding with terrestrial

latitude

LATITUDE (Lat. latitudo, latus, broad)

.

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