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Meridional :: Meridional (a.) Of or pertaining to the meridian.

Pole :: Pole (n.) A point upon the surface of a sphere equally distant from every part of the circumference of a great circle; or the point in which a diameter of the sphere perpendicular to the plane of such circle meets the surface. Such a point is called the pole of that circle; as, the pole of the horizon; the pole of the ecliptic; the pole of a given meridian..

Rhumb :: Rhumb (n.) A line which crosses successive meridians at a constant angle; -- called also rhumb line, and loxodromic curve. See Loxodromic..

Northing :: Northing (n.) Distance northward from any point of departure or of reckoning, measured on a meridian; -- opposed to southing..

Metre :: Metre (n.) A measure of length, equal to 39.37 English inches, the standard of linear measure in the metric system of weights and measures. It was intended to be, and is very nearly, the ten millionth part of the distance from the equator to the north pole, as ascertained by actual measurement of an arc of a meridian. See Metric system, under Metric..

Meridian :: Meridian (a.) 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..

Day :: Day (n.) The period of the earth's revolution on its axis. -- ordinarily divided into twenty-four hours. It is measured by the interval between two successive transits of a celestial body over the same meridian, and takes a specific name from that of the body. Thus, if this is the sun, the day (the interval between two successive transits of the sun's center over the same meridian) is called a solar day; if it is a star, a sidereal day; if it is the moon, a lunar day. See Civil day, Sidereal day

Circummeridian :: Circummeridian (a.) About, or near, the meridian..

Culmination :: Culmination (n.) The attainment of the highest point of altitude reached by a heavently body; passage across the meridian; transit.

Noon :: Noon (n.) The middle of the day; midday; the time when the sun is in the meridian; twelve o'clock in the daytime.

Postmeridian :: Postmeridian (a.) Fig., belonging to the after portion of life; late..

Antoecians :: Antoecians (n. pl) Those who live under the same meridian, but on opposite parallels of latitude, north and south of the equator..

Declination :: Declination (n.) The arc of the horizon, contained between the vertical plane and the prime vertical circle, if reckoned from the east or west, or between the meridian and the plane, reckoned from the north or south..

Meridian :: Meridian (a.) Being at, or pertaining to, midday; belonging to, or passing through, the highest point attained by the sun in his diurnal course..

Magnetical :: Magnetical (a.) Of or pertaining to, or characterized by, the earth's magnetism; as, the magnetic north; the magnetic meridian..

Meridian :: Meridian (a.) Midday; noon.

Westing :: Westing (n.) The distance, reckoned toward the west, between the two meridians passing through the extremities of a course, or portion of a ship's path; the departure of a course which lies to the west of north..

Perioecians :: Perioecians (n. pl.) Those who live on the same parallel of latitude but on opposite meridians, so that it is noon in one place when it is midnight in the other. Compare Antoeci..

Inferior :: Inferior (a.) Below the horizon; as, the inferior part of a meridian..

Antemeridian :: Antemeridian (a.) Being before noon; in or pertaining to the forenoon. (Abbrev. a. m..

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