 | William Chauvenet - 1864 - 720 pages
...the transit instrument is seldom, if ever, precisely adjusted in the meridian, the clock time !Tof the true meridian transit of a star is itself deduced...not required that the instrument should indicate the tme altitude ; it is sufficient if the altitude is the same at both observations. If we use the same... | |
 | William Mitchell Gillespie - 1897 - 488 pages
...Fixed Star.— The time of the meridian transit of a fixed star is the mean of the two times at which it is at the same altitude east and west of the meridian ; hence, if no transit instrument is available, and we have an instrument that will enable ns to obtain... | |
 | John Thornton - 1899 - 460 pages
...and 1 A more accurate result will be obtained if a star be observed by means of a suitable telescope when it is at the same altitude east and west of the meridian, for the mean of the two readings of the azimuth circle will give the exact direction of the meridian.... | |
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... will be fully discussed in Vol. II. It will there be seen, also, that the time may be found from transits over any vertical circle. SECOND METHOD. — BY EQUAL ALTITUDES. 139. (A.) Equal altitudes of a fixed star. — The time of the meridian transit... 