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Telescopy :: Telescopy (n.) The art or practice of using or making telescopes.

Rille :: Rille (n.) One of certain narrow, crooked valleys seen, by aid of the telescope, on the surface of the moon..

Micrometer :: Micrometer (n.) An instrument, used with a telescope or microscope, for measuring minute distances, or the apparent diameters of objects which subtend minute angles. The measurement given directly is that of the image of the object formed at the focus of the object glass..

Binocular :: Binocular (a.) Adapted to the use of both eyes; as, a binocular microscope or telescope..

Power :: Power (n.) The degree to which a lens, mirror, or any optical instrument, magnifies; in the telescope, and usually in the microscope, the number of times it multiplies, or augments, the apparent diameter of an object; sometimes, in microscopes, the number of times it multiplies the apparent surface..

Telescopist :: Telescopist (n.) One who uses a telescope.

Collimate :: Collimate (v. t.) To render parallel to a certain line or direction; to bring into the same line, as the axes of telescopes, etc.; to render parallel, as rays of light..

Galaxy :: Galaxy (n.) The Milky Way; that luminous tract, or belt, which is seen at night stretching across the heavens, and which is composed of innumerable stars, so distant and blended as to be distinguishable only with the telescope. The term has recently been used for remote clusters of stars..

Equatorial :: Equatorial (n.) An instrument consisting of a telescope so mounted as to have two axes of motion at right angles to each other, one of them parallel to the axis of the earth, and each carrying a graduated circle, the one for measuring declination, and the other right ascension, or the hour angle, so that the telescope may be directed, even in the daytime, to any star or other object whose right ascension and declination are known. The motion in right ascension is sometimes communicated by clockw

Telescopical :: Telescopical (a.) Seen or discoverable only by a telescope; as, telescopic stars..

Telescopically :: Telescopically (adv.) In a telescopical manner; by or with the telescope.

Erector :: Erector (n.) An attachment to a microscope, telescope, or other optical instrument, for making the image erect instead of inverted..

Telescope :: Telescope (n.) An optical instrument used in viewing distant objects, as the heavenly bodies..

Collimation :: Collimation (n.) The act of collimating; the adjustment of the line of the sights, as the axial line of the telescope of an instrument, into its proper position relative to the other parts of the instrument..

Speculum :: Speculum (n.) A reflector of polished metal, especially one used in reflecting telescopes. See Speculum metal, below..

Ocular :: Ocular (n.) The eyepiece of an optical instrument, as of a telescope or microscope..

Trombone :: Trombone (n.) A powerful brass instrument of the trumpet kind, thought by some to be the ancient sackbut, consisting of a tube in three parts, bent twice upon itself and ending in a bell. The middle part, bent double, slips into the outer parts, as in a telescope, so that by change of the vibrating length any tone within the compass of the instrument (which may be bass or tenor or alto or even, in rare instances, soprano) is commanded. It is the only member of the family of wind instruments whos

Ghost :: Ghost (n.) A false image formed in a telescope by reflection from the surfaces of one or more lenses.

Reflector :: Reflector (n.) A reflecting telescope.

Telescopical :: Telescopical (a.) Having the power of extension by joints sliding one within another, like the tube of a small telescope or a spyglass; especially (Mach.), constructed of concentric tubes, either stationary, as in the telescopic boiler, or movable, as in the telescopic chimney of a war vessel, which may be put out of sight by being lowered endwise..

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