meridian instrument
21Transit instrument — Transit Trans it, n. [L. transitus, from transire to go over: cf. F. transit. See {Transient}.] 1. The act of passing; passage through or over. [1913 Webster] In France you are now . . . in the transit from one form of government to another.… …
22Transit instrument — In astronomy, transit instruments are used for the precise observation of star positions. The instruments can be divided into three groups: Meridian instruments for observation of star transits in the exact direction of South or North: * Meridian …
23transit instrument — noun a telescope mounted on an axis running east and west and used to time the transit of a celestial body across the meridian • Hypernyms: ↑telescope, ↑scope * * * noun 1. : a telescope that is mounted at right angles to a horizontal east west… …
24Mural instrument — Tycho Brahe s mural quadrant …
25International Meridian Conference — Vertical red line (down the middle) is the Prime Meridian. The International Meridian Conference was a conference held in October 1884 in Washington, D.C., in the United States to determine the Prime Meridian of the world. The conference was held …
26Prime-vertical transit instrument — Prime Prime, a. [F., fr. L. primus first, a superl. corresponding to the compar. prior former. See {Prior}, a., {Foremost}, {Former}, and cf. {Prim}, a., {Primary}, {Prince}.] 1. First in order of time; original; primeval; primitive; primary.… …
27Prime meridian — Prime Prime, a. [F., fr. L. primus first, a superl. corresponding to the compar. prior former. See {Prior}, a., {Foremost}, {Former}, and cf. {Prim}, a., {Primary}, {Prince}.] 1. First in order of time; original; primeval; primitive; primary.… …
28Greenwich meridian — ▪ geography imaginary line used to indicate 0° longitude that passes through Greenwich, a borough of London, and terminates at the North and South poles. An international conference held in Washington, D.C., in 1884 designated “the meridian …
29transit instrument — n. 1. a telescope mounted at right angles to a horizontal east west axis so that it can be rotated only in the vertical plane of the meridian at its site: used to observe and time the transit of celestial bodies across the meridian 2. TRANSIT… …
30Navigational instrument — Navigational instruments refers to the instruments used by nautical navigators and pilots as tools of their trade. The purpose of navigation is to ascertain the present position and to determine the speed, direction etc. to arrive at the port or… …
