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Speculator :: Speculator (n.) One who speculates. Specifically: (a) An observer; a contemplator; hence, a spy; a watcher..

Observership :: Observership (n.) The office or work of an observer.

Observer :: Observer (n.) One who fulfills or performs; as, an observer of his promises..

Watcher :: Watcher (n.) One who watches; one who sits up or continues; a diligent observer; specifically, one who attends upon the sick during the night..

Eclipse :: Eclipse (n.) An interception or obscuration of the light of the sun, moon, or other luminous body, by the intervention of some other body, either between it and the eye, or between the luminous body and that illuminated by it. A lunar eclipse is caused by the moon passing through the earth's shadow; a solar eclipse, by the moon coming between the sun and the observer. A satellite is eclipsed by entering the shadow of its primary. The obscuration of a planet or star by the moon or a planet, thoug

Observer :: Observer (n.) A sycophantic follower.

Telemeter :: Telemeter (n.) An instrument used for measuring the distance of an object from an observer; as, a telescope with a micrometer for measuring the apparent diameter of an object whose real dimensions are known..

Heliotrope :: Heliotrope (n.) An instrument for making signals to an observer at a distance, by means of the sun's rays thrown from a mirror..

Stereoscopic :: Stereoscope (n.) An optical instrument for giving to pictures the appearance of solid forms, as seen in nature. It combines in one, through a bending of the rays of light, two pictures, taken for the purpose from points of view a little way apart. It is furnished with two eyeglasses, and by refraction or reflection the pictures are superimposed, so as to appear as one to the observer..

Sabbatarian :: Sabbatarian (n.) A strict observer of the Sabbath.

Geodetical :: Geodetical (a.) Of or pertaining to geodesy; obtained or determined by the operations of geodesy; engaged in geodesy; geodesic; as, geodetic surveying; geodetic observers..

Close :: Close (v. t.) Accurate; careful; precise; also, attentive; undeviating; strict; not wandering; as, a close observer..

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..

Backstaff :: Backstaff (n.) An instrument formerly used for taking the altitude of the heavenly bodies, but now superseded by the quadrant and sextant; -- so called because the observer turned his back to the body observed..

Speculist :: Speculist (n.) One who observes or considers; an observer.

Studentry :: Student (n.) One who studies or examines in any manner; an attentive and systematic observer; as, a student of human nature, or of physical nature..

Observer :: Observer (n.) One who keeps any law, custom, regulation, rite, etc.; one who conforms to anything in practice..

Minute :: Minute (a.) Attentive to small things; paying attention to details; critical; particular; precise; as, a minute observer; minute observation..

Misobserver :: Misobserver (n.) One who misobserves; one who fails to observe properly.

Acute :: Acute (a.) Having nice discernment; perceiving or using minute distinctions; penetrating; clever; shrewd; -- opposed to dull or stupid; as, an acute observer; acute remarks, or reasoning..

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