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is; amounting when greatest, in the former case, to 20.4'', and in the latter, to 0.3''. Planetary aberration is that due to the motion of light and the motion of the planet relative to the earth.

om.), that curvature of a curve of double curvature, which is measured in the osculating plane of the curve. -- Absolute equation (Astron.), the sum of the optic and eccentric equations. -- Absolute space (Physics), space considered without relation to material limits or objects. -- Absolute terms. (Alg.), such as a…

fty-six seconds of solar time earlier than on the day preceding. -- Acceleration of the planets, the increasing velocity of their motion, in proceeding from the apogee to the perigee of their orbits.

h a right line, drawn from the eye, parallel to a given right line, cuts the perspective plane; so called to distinguish it from the principal point, or point of view, where a line drawn from the eye perpendicular to the perspective plane meets this plane. -- Accidental lights (Paint.), secondary lights; effects of li…

A miscellaneous collection of notes, remarks, or selections; a commonplace book; also, commentaries or notes. These parchments are supposed to have been St. Paul's adversaria. Bp. Bull.

A form of hydro-aëroplane; a flying boat.

An aëroplane or airship designed to carry passengers.

A modification of the aëroplane, having curved surfaces, the advantages of which were first demonstrated by Lilienthal.

A plane or arched surface for sustaining bodies by its movement through the air; a spread wing, as of a bird.

One who flies in an aëroplane.

A form of hydro-aëroplane; a flying boat.

consolation in old age. His tuneful Muse affords the sweetest numbers. Addison. The quiet lanes . . . afford calmer retreats. Gilpin.

(Aëronautics) A small plane or surface capable of being manipulated by the pilot of a flying machine to preserve or destroy lateral balance; a hinged wing tip; a lateral stabilizing or balancing plane.

Any device, as a balloon, aëroplane, etc., for floating in, or flying through, the air.

age in a garden or park, bordered by rows of trees or bushes; a bordered way. I know each lane and every alley green. Milton.

Alignment; position in a straight line, as of two planets with the sun. Whewell. The allineation of the two planets. C. A. Young.

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.

A distorted or monstrous projection or representation of an image on a plane or curved surface, which, when viewed from a certain point, or as reflected from a curved mirror or through a polyhedron, appears regular and in proportion; a deformation of an image.

by a quarter circle). -- Solid angle, the figure formed by the meeting of three or more plane angles at one point. -- Spherical angle, one made by the meeting of two arcs of great circles, which mutually cut one another on the surface of a globe or sphere. -- Visual angle, the angle formed by two rays of light, or t…

nce. -- Angular motion, the motion of a body about a fixed point or fixed axis, as of a planet or pendulum. It is equal to the angle passed over at the point or axis by a line drawn to the body. -- Angular point, the point at which the sides of the angle meet; the vertex. -- Angular velocity, the ratio of anuglar mo…