transit instrument

noun

transit instrument

an astronomical instrument, mounted on an E-W axis, in which the reticle of a telescope is always in the plane of the meridian. It is used to time the transit of a star, etc, across the meridian

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First recorded in 1805–15

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Examples have not been reviewed.

Of or pertaining to the azimuth; in a horizontal circle. ÷ error of a transit instrument, its deviation in azimuth from the plane of the meridian.

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The dome contains an equatorial telescope, and the flank towers a transit instrument and mural circle.

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Surveyors make use of this proposition when they wish, without using a transit instrument, to run one line parallel to another.

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The direction of the meridian is determined either by a theodolite or a portable transit instrument.

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In the first plan which was tried, the reflector was used as a transit instrument.

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