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almanac an annually published calendar, traditionally used by farmers, that predicts weather and times of celestial events such as lunar phases, sunrises and sunsets, and the like, and lists other useful data. [1/3 definitions]
alt.2 abbreviation of "altitude," the height of a given object or location above a specified base, such as sea level or earth, esp. the angular distance of a celestial body, measured from the horizon.
altitude in astronomy, the angular distance of a celestial body, measured from the horizon. [1/4 definitions]
archangel a high-ranking celestial being, esp. in medieval Christian theology, a member of the nine orders of angels. [1/2 definitions]
asteroid any of thousands of celestial bodies with diameters between one and five hundred miles that revolve around the sun in orbits that lie mostly between the orbits of Jupiter and Mars; planetoid.
atmosphere the mass of gases surrounding the earth or any other celestial body. [1/3 definitions]
celestial equator a great circle, corresponding to the earth's equator, on the celestial sphere.
celestial pole either of two points in the celestial sphere that the earth's axis would intersect if it were extended.
celestial sphere the infinitely large, imaginary sphere around the earth in which the stars, planets, and other celestial objects seem to be located.
circumpolar moving around or close to one of the poles of the earth or of the celestial sphere.
colure either of the two great circles of the celestial sphere that intersect at the poles, one passing through the solstices and the other through the equinoxes.
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]
eclipse at a particular observation point, the blocking of light from one celestial body by another, such as the eclipse of the sun by the interposition of the moon, or the eclipse of the moon by the earth's coming between the sun and moon. [1/6 definitions]
ephemeris a table or a collection of tables giving the projected positions of celestial bodies for every day of a certain period.
equinoctial concerning the celestial equator. [2/5 definitions]
equinoctial circle see "celestial equator."
geochemistry the scientific study of the chemical composition of Earth or other celestial bodies and how this chemical composition changes. [2 definitions]
globe a planet or other celestial body. [1/6 definitions]
magnitude the measure of brightness of a celestial body. [1/4 definitions]
map a representation of a geographic or celestial region, usu. drawn or printed to scale on a flat surface. [1/3 definitions]