## 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 |

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### Common terms and phrases

adjustment alidade angular distance azimuth centre chronometer circle reading clock correction coincidence collimation axis computed constant declination axis declination circle deduce denote determined difference division east equations of condition equatorial intervals equatorial star eye piece ﬁeld ﬁnal ﬁnd ﬁnder ﬁnding ﬁrst ﬁxed ﬂexure follows formula given gives graduated heliometer Hence horizontal hour angle latitude lens limb magnifying power mean error measure meridian circle micrometer thread microscopes middle thread moon’s motion nadir nearly normal equations number of observations obtained ocular perpendicular pivots plane pole position angle position circle prime vertical probable error rays reduced refraction reversed revolved right ascension rotation axis screw semi-lens sextant sidereal sight line spirit level star star’s substitute suﬁicient suppose telescope tion transit instrument transit threads tube unknown quantities vernier vertical circle weight whence zenith distance zenith telescope zero