Transit
Transit in astronomy, the apparent passage of a star or other celestial body across a defined line of the celestial sphere, as a meridian, prime vertical, or almucantar when no line is specified, a transit across the meridian is usually intended see meridian transit. The apparent passage of a star or other celestial body across a line in the reticle of a telescope, or some line of sight. The apparent passage of a smaller celestial body across the disk of a larger celestial body. A surveying instrument composed of a horizontal circle graduated in circular measure and an alidade with a telescope which can be reversed in its supports without being lifted therefrom also, the act of making such a reversal a theodolite having a telescope that can be transited in its supports is a transit, and is sometimes termed a transit theodolite all modern theodolites are transits. An astronomical instrument having a telescope which can be so adjusted in position that the line of sight may be made to define a vertical circle a transit used in astronomical work is usually termed either an astronomical transit or a transit instrument. In navigation, the position of two distant, fixed objects when they are in line to an observer, the line passing through them and the observer being a line of position see also
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