The elements of theoretical and descriptive astronomy, for the use of colleges and academies (1872)
White, Charles J. (Charles Joyce), 1839-1917 · Philadelphia, Claxton, Remsen & Haffelfinger · leaf 39
s of rotation mustbe exactly horizontal; it must lie exactly east and west; and theline of sight and the axis of collimation must exactly coincide.Practically, these conditions are rarely fulfilled; but they can, byrepeated experiments, be very nearly fulfilled, and the errorswhich the failure… … Fig 7. 34 THE MERIDIAN CIRCLE, instrument in observatories is to the determination of the rightascensions of celestial bodies. Knowing the constant instru-mental errors just now mentioned, and the error and the rate ofthe clock, we can easily obtain the true sidereal time at theinstant of the…
Astronomy
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