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The solid formed by a circle revolving around a line which is the plane of the circle but does not cut it.

Pertaining to the anomaly, or angular distance of a planet from its perihelion. Anomalistic month. See under Month. -- Anomalistic revolution, the period in which a planet or satellite goes through the complete cycles of its changes of anomaly, or from any point in its elliptic orbit to the same again. -- Anomalistic…

The angular distance of a planet from its perihelion, as seen from the sun. This is the true anomaly. The eccentric anomaly is a corresponding angle at the center of the elliptic orbit of the planet. The mean anomaly is what the anomaly would be if the planet's angular motion were uniform.

An apparent motion of a planet toward the west; retrogradation.

A structure of bedded rocks in which the beds on both sides of an axis or axial plane dip away from the axis; an anticlinal.

Straight lines or planes which make angles in some respect opposite in character to those made by parallel lines or planes.

That point of a planet's or comet's orbit which is most distant from the sun, the opposite point being the perihelion.

Striking against; impinging; as, the appulsive influence of the planets. P. Cyc.

One of the two points of an orbit, as of a planet or satellite, which are at the greatest and least distance from the central body, corresponding to the aphelion and perihelion of a planet, or to the apogee and perigee of the moon. The more distant is called the higher apsis; the other, the lower apsis; and the line jo…

Any plane surface, as of the floor of a room or church, or of the ground within an inclosure; an open space in a building. The Alban lake . . . looks like the area of some vast amphitheater. Addison.

The sharp edge or salient angle formed by two surfaces meeting each other, whether plane or curved; -- applied particularly to the edges in moldings, and to the raised edges which separate the flutings in a Doric column. P. Cyc. Arris fillet, a triangular piece of wood used to raise the slates of a roof against a chimn…

ite. -- As*cend"ing*ly, adv. Ascending latitude (Astron.), the increasing latitude of a planet. Ferguson. -- Ascending line (Geneol.), the line of relationship traced backward or through one's ancestors. One's father and mother, grandfather and grandmother, etc., are in the line direct ascending. -- Ascending node h…

The situation of planets or stars with respect to one another, or the angle formed by the rays of light proceeding from them and meeting at the eye; the joint look of planets or stars upon each other or upon the earth. Milton.

The ratio of the long to the short side of an aëroplane, aërocurve, or wing.

A starlike body; esp. one of the numerous small planets whose orbits lie between those of Mars and Jupiter; -- called also planetoids and minor planets.

A stereographic projection of the sphere on the plane of a great circle, as the equator, or a meridian; a planisphere. Whewell.

The determination of the brightness of stars, and also of the sun, moon, and planets. --As`tro*pho`to*met"ric*al (#), a.

Automatic stability; also, inherent stability. An aëroplane is inherently stable if it keeps in steady poise by virtue of its shape and proportions alone; it is automatically stable if it keeps in steady poise by means of self-operative mechanism.

To fly, or navigate the air, in an aëroplane or heavier-than- air flying machine. [Colloq.]

is wielded by a wooden helve or handle, so fixed in a socket or eye as to be in the same plane with the blade. The broadax, or carpenter's ax, is an ax for hewing timber, made heavier than the chopping ax, and with a broader and thinner blade and a shorter handle.