Transit

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Transit

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1. The passage of a celestial body across a celestial meridian, usually called meridian transit. </dd>
2. The apparent passage of a celestial body across the face of another celestial body or across any point, area, or line. </dd>
3. An instrument used by an astronomer to determine the exact instant of meridian transit of a celestial body. </dd>
4. A reversing instrument used by surveyors for accurately measuring horizontal and vertical angles; a theodolite which can be reversed in its supports without being lifted from them. [[/a>|/a> ]]

References

This article is based on NASA's Dictionary of Technical Terms for Aerospace Use