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plane of which is at right angles to the direction of the plumb line. Sometimes a distinction is made between the rational and the apparent horizon, the former being the horizon as determined by a plane through the centre of the earth, parallel to that through the station of an observer. But on the See also:

CELESTIAL, OR STELLAR

celestial sphere the great circles of these two planes are coincident, so that this distinction is not necessary (see ASTRONOMY: Spherical). The See also:

DIP (Old Eng. dyppan, connected with the common Teutonic root seen in " deep ")

Dip of the horizon at sea is the angular depression of the apparent sea See also:

HOREHOUND (0. Eng. harhune, Ger. Andorn, Fr. marrube)

Horehound. horizon, or circle bounding the visible ocean, below the apparent celestial horizon as above defined. It is due to the rotundity of the earth, and the height of the observer's See also:

eye above the See also:

WATER

water. The dip of the horizon and its distance in sea-See also:

MILES, NELSON APPLETON (1839— )

miles when the height of the observer's eye above the sea-level islt feet, are approximately given by the formulae: Dip =o'.97 ~Ih; Distance = I'"• 17 -h. The difference between the coefficients 0.97 and 1.17 arises from the See also:

refraction of the See also:

ray, but for which they would be equal.

End of Article: HORIZON (Gr. 6pfTwv, dividing)

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