Newcomb, Simon, 1835-1909 · New York, H. Holt & company · leaf 72
s the star's north-polar dis- diurnal orbit. PS the observer's latitude. tance, and P H — q) ZS+ZS' =^ ZP = 90° cp. 2 ZS^ZS' ^ = 90° - Therefore 2 We can measure ZS and ZS', the zenith distances of the star in the two positions, by the meridian circle or by the sextant, as will be explained in the… … FiG- 16. imum. From the measured altitude of the star S we deduce its zenith distance ZS = <? = 90°— II S. Its declination is taken from a catalogue of stars if it is a star, or from the Nautical Almanac if it is the sun. In either case the declination Q S is known. ZQ=QS^-ZS; If the body…
Astronomy
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