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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..

South :: South (v. i.) To come to the meridian; to cross the north and south line; -- said chiefly of the moon; as, the moon souths at nine..

Southing :: Southing (n.) The time at which the moon, or other heavenly body, passes the meridian of a place..

Appulse :: Appulse (n.) The near approach of one heavenly body to another, or to the meridian; a coming into conjunction; as, the appulse of the moon to a star, or of a star to the meridian..

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..

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

Meridian :: Meridian (a.) Pertaining to the highest point or culmination; as, meridian splendor..

Southing :: Southing (n.) Distance southward from any point departure or of reckoning, measured on a meridian; -- opposed to northing..

Midheaven :: Midheaven (n.) The meridian, or middle line of the heavens; the point of the ecliptic on 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..

Meridian :: Meridian (a.) A great circle of the sphere passing through the poles of the heavens and the zenith of a given place. It is crossed by the sun at midday.

Easting :: Easting (n.) The distance measured toward the east between two meridians drawn through the extremities of a course; distance of departure eastward made by a vessel.

Meridionality :: Meridionality (n.) The state of being in the meridian.

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..

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

Astrolabe :: Astrolabe (n.) A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere..

Analemma :: Analemma (n.) An orthographic projection of the sphere on the plane of the meridian, the eye being supposed at an infinite distance, and in the east or west point of the horizon..

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

Postmeridian :: Postmeridian (a.) Coming after the sun has passed the meridian; being in, or belonging to, the afternoon. (Abbrev. P. M.).

Drift :: Drift (n.) The angle which the line of a ship's motion makes with the meridian, in drifting..

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