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sphere of action ambit , arena , compass , orb , orbit , range , reach , scope
range, sphere, or scope ambit , orbit , radius
point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars apex , apex of the sun's way , solar apex
freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone articulatio spheroidea , ball-and-socket joint , cotyloid joint , enarthrodial joint , enarthrosis , spheroid joint
sphere of activity, expertise bailiwick , domain , preserve , province
early stage of an embryo produced by cleavage of an ovum; a liquid-filled sphere whose wall is composed of a single layer of cells; during this stage (about eight days after fertilization) implantation in the wall of the uterus occurs blastodermic vesicle , blastula
air-filled sphere bubble
small sphere of camphor or naphthalene used to keep moths away from stored clothing camphor ball , mothball
great circle on the celestial sphere midway between the celestial poles celestial equator , equinoctial , equinoctial circle , equinoctial line
great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth celestial horizon , horizon
(astronomy) the angular distance of a celestial body north or south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere celestial latitude , dec , declination
point in the heavens (on the celestial sphere) celestial point
one of two points of intersection of the Earth's axis and the celestial sphere celestial pole , pole
apparent surface of the imaginary sphere on which celestial bodies appear to be projected celestial sphere , empyrean , firmament , heavens , sphere , vault of heaven , welkin
specialized sphere of knowledge department
straight line connecting the center of a circle with two points on its perimeter (or the center of a sphere with two points on its surface) diameter
sphere of work by women distaff
forces at work in a sphere dynamics
non-Euclidean geometry that regards space is like a sphere and a line is a great circle elliptic geometry , Riemannian geometry
circle dividing a sphere or other surface into two usually equal and symmetrical parts equator
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