Elementary Mathematical Astronomy With Examples And Examination Papers
Elementary Mathematical Astronomy With Examples And Examination Papers
Crossley William Crosby Barlow
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The disadvantages of using local time are obviated in Great Britain by the universal use of " Greenwich Mean Time. " 179. Practical Applications. In 41 we showed how to determine roughly the time of night at which a given star would transit on a given day of the year. "With the intro- duction of mean time, in the present chapter, we are in a position to obtain a more accurate solution of the problem. Por the R. A. Of any star (expressed in time) is its sidereal time of transit. If this be given..., we only have to find the corresponding mean time ; this will be the required time of transit, as indicated by an ordinary clock. In the calculations required in converting the time from one measure to the other, it is advisable not to quote the formula? of 174-177, but to go through the various steps one by one. If neither the sidereal time of mean noon nor the mean time of sidereal noon is given, we must fall back on the rough method of 35. ON TIME. 135 EXAMPLES. 1. Find the solar time at 5h.
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