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The meeting of two or more stars or planets in the same degree of the zodiac; as, the conjunction of the moon with the sun, or of Jupiter and Saturn. See the Note under Aspect, n., 6.

always to meet a given straight line and a given curve, and continue parallel to a given plane. Math. Dict.

Burke. Conservation of areas (Astron.), the principle that the radius vector drawn from a planet to the sun sweeps over equal areas in equal times. -- Conservation of energy, or Conservation of force (Mech.), the principle that the total energy of any material system is a quantity which can neither be increased nor di…

The plane between two adjacent bodies of dissimilar rock. Raymond. Contact level, a delicate level so pivoted as to tilt when two parts of a measuring apparatus come into contact with each other; -- used in precise determinations of lengths and in the accurate graduation of instruments.

ts undulation, etc. -- Contour line (Topographical Suv.), the line in which a horizontal plane intersects a portion of ground, or the corresponding line in a map or chart.

n of qualities. The joints which divide the sandstone contrast finely with the divisional planes which separate the basalt into pillars. Lyell.

position of any point, as of a curve, is defined with respect to certain fixed lines, or planes, called coördinate axes and coördinate planes. See Abscissa.

Situated in one plane.

ed to support, lift, or carry ships or other vessels, heavy guns, etc., as up an inclined plane, or across a strip of land, or in launching a ship.

ting or planing. If the stuff proves crossgrained, . . . then you must turn your stuff to plane it the contrary way. Moxon.

A wheel with cogs or teeth set at right angles to its plane; -- called also a contrate wheel or face wheel.

ssume in solidifying, through the inherent power of cohesive attraction. It is bounded by plane surfaces, symmetrically arranged, and each species of crystal has fixed axial ratios. See Crystallization.

same number. See Cube. -- Cubical parabola (Geom.), two curves of the third degree, one plane, and one on space of three dimensions.

A small central plane in the back of a cut gem. See Collet, 3 (b).

Shortened or reduced; -- said of the distance of a planet from the sun or earth, as measured in the plane of the ecliptic, or the distance from the sun or earth to that point where a perpendicular, let fall from the planet upon the plane of the ecliptic, meets the ecliptic. Curtate cycloid. (Math.) See Cycloid.…

The interval by which the curtate distance of a planet is less than the true distance.

pe, location, singular points, and other perculiarities of a curve from its equation. -- Plane curve (Geom.), a curve such that when a plane passes through three points of the curve, it passes through all the other points of the curve. Any other curve is called a curve of double curvature, or a twisted curve.…

A curve generated by a point in the plane of a circle when the circle is rolled along a straight line, keeping always in the same plane.

A plane figure having ten sides and ten angles; any figure having ten angles. A regular decagon is one that has all its sides and angles equal.

A solid figure or body inclosed by ten plane surfaces. [Written also, less correctly, decaedron.]