## An Introduction to Spherical and Practical Astronomy |

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adjustment arithmetical mean Astronomy axis body celestial sphere change of declination Chapter circumpolar star clock correction clock error co-ordinates collimation computed constant culmination denote determined difference of azimuth difference of longitude ecliptic equal altitudes equations of condition equatorial intervals Example formulae gives Greenwich mean hence horizon images index correction large number latitude mean error mean solar mean wire measured meridian passage middle wire moon's multiplied Nautical Almanac number of errors number of observations parallax parallel perpendicular plane pole position prime vertical probability curve probable error probable values radius readings reduced right ascension screw semi-diameter sextant sidereal clock sidereal day sidereal interval signal sin2 f solar day spherical spheroid star's substituted sun's hour angle Suppose tangent telescope tion transit instrument transit observations triangle unknown quantities vernal equinox vertical wires whence zenith distance