| 单词 | prime vertical transit instrument |
| 释义 | > as lemmasprime vertical transit instrument prime vertical transit instrument n. (also prime vertical instrument, prime vertical transit) Astronomy a transit instrument incorporating a telescope which revolves in the plane of the prime vertical circle, used for timing the passage of a celestial object across this circle. ΚΠ 1847 U.S. Mag. & Democratic Rev. Jan. 68 By measurement, the prime vertical transit is 45 feet south of the mural circle. 1867 D. Lardner & E. Dunkin Handbk. Astron. (ed. 3) ii. 33 The Pulkowa prime vertical instrument was constructed, under the direction of Professor Struve, by Messrs. Repsold, of Hamburg. 1901 Science 20 Dec. 949 (heading) The prime vertical transit instrument and the 5-inch azimuth. 1985 R. M. Green Spherical Astron. v. 128 A prime vertical transit instrument can only be used to observe stars in the range 0 < δ < ϕ. < as lemmas |
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