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| altitude |
in astronomy, the angular distance of a celestial body, measured from the horizon. [1/4 definitions] |
| archaeoastronomy |
the study of the astronomy of prehistoric cultures. |
| astronomical |
of or pertaining to astronomy. [1/2 definitions] |
| azimuth |
an arc measured horizontally and clockwise from a point north, in navigation, or a point south, in astronomy, to another point where a vertical circle intersects the horizon. [1/2 definitions] |
| configuration |
in astronomy, the relative position or arrangement of stars or of a particular group of stars. [1/6 definitions] |
| conjunction |
in astronomy and astrology, the lining up of two or more celestial bodies, esp. the sun and a planet, along a line as viewed from Earth. [1/4 definitions] |
| declination |
in astronomy, the angular distance of some object from the celestial equator. [1/5 definitions] |
| epicycle |
in early astronomy, a small circle whose center moves along the circumference of a larger circle. [1/2 definitions] |
| inferior |
in astronomy, designating a planet that is nearer to the sun than is the earth. [1/5 definitions] |
| perigee |
in astronomy, the point in the orbit of a moon or other satellite at which it is closest to the earth. (Cf. apogee.) |
| physical science |
any science, such as chemistry, physics, astronomy, or geology, that deals with inanimate matter or energy. |
| Ptolemaic |
of or pertaining to Ptolemy or the system of astronomy he developed. |
| quadrivium |
in medieval universities, the higher section of the liberal arts, comprising arithmetic, geometry, astronomy, and music. (Cf. trivium.) |
| retrograde |
in astronomy, moving in a direction opposite to that of the movement of the earth around the sun. [2/4 definitions] |
| sphere of influence |
in astronomy, the region around a celestial body within which the primary gravitational force on an orbiting object is that body. [1/3 definitions] |
| superior |
in astronomy, designating a planet whose orbit is farther from the sun than is the orbit of earth. [1/9 definitions] |
| syzygy |
in astronomy, the alignment, either in conjunction or opposition, of three celestial bodies within the same gravitational system, esp. the sun, moon, and earth. [1/3 definitions] |
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