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Observer :: Observer (n.) One who observes, or pays attention to, anything; especially, one engaged in, or trained to habits of, close and exact observation; as, an astronomical observer..

Stadium :: Stadium (n.) A Greek measure of length, being the chief one used for itinerary distances, also adopted by the Romans for nautical and astronomical measurements. It was equal to 600 Greek or 625 Roman feet, or 125 Roman paces, or to 606 feet 9 inches English. This was also called the Olympic stadium, as being the exact length of the foot-race course at Olympia..

Year :: Year (n.) The time of the apparent revolution of the sun trough the ecliptic; the period occupied by the earth in making its revolution around the sun, called the astronomical year; also, a period more or less nearly agreeing with this, adopted by various nations as a measure of time, and called the civil year; as, the common lunar year of 354 days, still in use among the Mohammedans; the year of 360 days, etc. In common usage, the year consists of 365 days, and every fourth year (called bissext

Instrument :: Instrument (n.) That by means of which any work is performed, or result is effected; a tool; a utensil; an implement; as, the instruments of a mechanic; astronomical instruments..

Plane :: Plane (a.) An ideal surface, conceived as coinciding with, or containing, some designated astronomical line, circle, or other curve; as, the plane of an orbit; the plane of the ecliptic, or of the equator..

Astrophysical :: Astrophysical (a.) Pertaining to the physics of astronomical science.

Uranic :: Uranic (a.) Of or pertaining to the heavens; celestial; astronomical.

Reckoning :: Reckoning (n.) The calculation of a ship's position, either from astronomical observations, or from the record of the courses steered and distances sailed as shown by compass and log, -- in the latter case called dead reckoning (see under Dead); -- also used for dead reckoning in contradistinction to observation..

Astronomical :: Astronomical (a.) Of or pertaining to astronomy; in accordance with the methods or principles of astronomy.

Regulator :: Regulator (n.) A clock, or other timepiece, used as a standard of correct time. See Astronomical clock (a), under Clock..

Gastronomical :: Gastronomical (a.) Pertaining to gastromony.

Almagest :: Almagest (n.) The celebrated work of Ptolemy of Alexandria, which contains nearly all that is known of the astronomical observations and theories of the ancients. The name was extended to other similar works..

Almanac :: Almanac (n.) A book or table, containing a calendar of days, and months, to which astronomical data and various statistics are often added, such as the times of the rising and setting of the sun and moon, eclipses, hours of full tide, stated festivals of churches, terms of courts, etc..

Saros :: Saros (n.) A Chaldean astronomical period or cycle, the length of which has been variously estimated from 3,600 years to 3,600 days, or a little short of 10 years..

Ptolemaist :: Ptolemaist (n.) One who accepts the astronomical system of Ptolemy.

Rudolphine :: Rudolphine (a.) Pertaining to, or designating, a set of astronomical tables computed by Kepler, and founded on the observations of Tycho Brahe; -- so named from Rudolph II., emperor of Germany..

Terrestrial :: Terrestrial (a.) Adapted for the observation of objects on land and on the earth; as, a terrestrial telescope, in distinction from an astronomical telescope..

Sector :: Sector (n.) An astronomical instrument, the limb of which embraces a small portion only of a circle, used for measuring differences of declination too great for the compass of a micrometer. When it is used for measuring zenith distances of stars, it is called a zenith sector..

Sphere :: Sphere (n.) The apparent surface of the heavens, which is assumed to be spherical and everywhere equally distant, in which the heavenly bodies appear to have their places, and on which the various astronomical circles, as of right ascension and declination, the equator, ecliptic, etc., are conceived to be drawn; an ideal geometrical sphere, with the astronomical and geographical circles in their proper positions on it..

Venus :: Venus (n.) The metal copper; -- probably so designated from the ancient use of the metal in making mirrors, a mirror being still the astronomical symbol of the planet Venus..

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