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Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no.26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903

Theory of the astronomical transit instrument applied to the portable transit instrument Wuerdemann no. 26: a compilation from various authorities, with original observations by Harry Edward Burton, 1903, Page 44

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first approximation to the meridian may be made by observing upon Polaris, and computing the azimuth approximately by use of the tables of azimuths of Polaris at different hour angles, and then, by means of the graduated arc, swinging the instrument into the meridian. Where saving of time is an important consideration, the latter method has the advantage that Polaris may be found in daylight, when the sun is not too high, by setting the telescope at the computed altitude and moving it slowly in azimuth near the meridian. See "Geographic Tables and Formulas", compiled by Samuel S. Gannett, for tables giving azimuths and altitudes of Polaris at different hour angles.
 
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