isosceles triangle, ellipsoid, equilateral triangle, celestial sphere, hexagon, ecliptic, rhombus, rectangle, tetrahedron, conic, arcsecond, asterism, zodiacal light, hypotenuse, centroid, radii, nebulosity, curvature, dodecahedron, celestial equator, convex, syrtis major, moonlet, horsehead nebula, semicircles, vertices, parallelogram, infinity, quasicrystal, torus, hexagram, azimuthal, geodesic, polyhedron, epsilon aurigae, convex lens, parabola, milky way galaxy, spiral galaxy, concavity, heliopause, galactic equator, geoid, eclipsing binary, oblique angle, gnomon, auroral, omega centauri, cumulus cloud, blackbody, photosphere, anisotropy, prograde, diagonals, triangular prism, isosceles, toroid, squiggle, planetary nebula, andromeda galaxy, pentagons, oort cloud, concave, oculus, radians, cirrus cloud, photometry, chromosphere, apse, diameter, starburst, equinoxes, spheroid, sidereal, interferometer, dipole moment, retroreflector, trapezoid, circumference, armillary sphere, nebula, cartesian coordinates, caudal fin, orb, rhomboid, frustum, earthshine, quincunx, geometry, oblate, whorls, euclidean, pushpin, icosahedral, capricornus, synclinal, orbits, coronagraph, protrusion, baryon, crescent, lagrangian, ellipses, circle, cone, square, ovals, triangle, oval, rectangles, semicircle, panel, cube, diagonal, hoop, curve, geometrical, flake, freehand, groove, rotated, tangent, abscissa, alignment, azimuth, blunter, cardboard, chine, condylar, confluence, cycloidal, dovetailed

circle, eccentricity, ellipsoid, ellipsoidal, ellipsoid of revolution, elliptic, elliptic leaf, kepler's first law, major axis, minor axis, non-circular, ovolo, prolate, quarter round, semimajor axis, semiminor axis, spheroid, spheroidal, thumb

conic section