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The arc of the horizon between the true east or west point and the foot of the vertical circle passing through any star or object.

c curves, a class of curves of the fourth degree which have certain peculiar relations to circles; -- sometimes called bicircular quartics. -- Anallagmatic surfaces, a certain class of surfaces of the fourth degree.

right line falling on another perpendicularly, or an angle of 90º (measured 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 g…

Banded or marked with circles. Annular eclipse (Astron.), an eclipse of the sun in which the moon at the middle of the eclipse conceals the central part of the sun's disk, leaving a complete ring of light around the border.

A little circle borne as a charge.

A space contained between the circumferences of two circles, one within the other.

pole; relating to the southern pole or to the region near it, and applied especially to a circle, distant from the pole 23º 28min. Thus we say the antarctic pole, circle, ocean, region, current, etc.

sible magnitude was by astronomers called apparent magnitude. Reid. Apparent horizon, the circle which in a level plain bounds our view, and is formed by the apparent meeting of the earth and heavens, as distinguished from the rational horizon. -- Apparent time. See Time. -- Heir apparent (Law), one whose to an estat…

tar or other luminary after having been invisible or obscured; -- opposed to occultation. Circle of perpetual apparition. See under Circle.

A portion of a curved line; as, the arc of a circle or of an ellipse.

under, the northern constellation called the Bear; northern; frigid; as, the arctic pole, circle, region, ocean; an arctic expedition, night, temperature.

le (Math.), that in which the unit angle has its measuring arc equal to the radius of the circle.

Pertaining to, or resembling, a bracelet or ring; consisting of rings or circles. Armillary sphere, an ancient astronomical machine composed of an assemblage of rings, all circles of the same sphere, designed to represent the positions of the important circles of the celestial sphere. Nichol.

In a circle; circularly; on every side; round.

A convex molding of rounded surface, generally from half to three quarters of a circle.

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

A kind of chætopod larva in which no circles of cilia are developed.

The circle of rays, or halo of light, with which painters surround the figure and represent the glory of Christ, saints, and others held in special reverence.

A circle of feathers surrounding the opening of the ear of birds.

, that is, the straight line joining the vertex and the center of the base; the axis of a circle, any straight line passing through the center.