A Manual of Spherical and Practical Astronomy: Embracing the General Problems of Spherical Astronomy, the Special Applications to Nautical Astronomy, and the Theory and Use of Fixed and Portable Astronomical Instruments, with an Appendix on the Method of Least Squares
J. B. Lippincott Company, 1906 - Astronomical instruments
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according altitude apparent applied approximate assumed axis azimuth becomes beginning called centre chronometer circle clock co-ordinates computed condition constant correction corresponding curve declination deduced denote determine difference direction earth eclipse effect employed Ephemeris equal equations error EXAMPLE expressed formula given gives greater Greenwich height hence horizon hour angle increase instant interval known latitude less limb limit longitude mean meridian method moon moon's motion nearly noon observed obtain parallax plane pole position practical preceding precession precision probable quantity reduced referred refraction regarded respectively result right ascension semidiameter sidereal simple sinē sphere star substitute sufficient sun's supposed surface taken term tion transit triangle true vertical whence zenith distance