The international geography . is is to select a circumpolar star, , a star which appears todescribe a circle round the pole without ever setting below the altitude of this star should be measured at its upper meridian passage,and again at its lower meridian passage (between the pole and thehorizon), and the half sum of these altitudes, when corrected for refraction,will be the altitude of the pole. The latitude can also be determined by observing the meridian altitudeof a celestial body whose position is known. Let HZN (Fig. 8) be themeridian, Z the zenith, P the pole, S the kn
The international geography . is is to select a circumpolar star, , a star which appears todescribe a circle round the pole without ever setting below the altitude of this star should be measured at its upper meridian passage,and again at its lower meridian passage (between the pole and thehorizon), and the half sum of these altitudes, when corrected for refraction,will be the altitude of the pole. The latitude can also be determined by observing the meridian altitudeof a celestial body whose position is known. Let HZN (Fig. 8) be themeridian, Z the zenith, P the pole, S the known body passing the meridian.,and HN the horizon. As the position of the body is known, the angulardistance from the pole, PS, is known, and the angular distance HS is theobserved altitude. Therefore PH is known, which, taken from 180°, givesPN the altitude of the pole, or the latitude. The latitude at sea, or in an unsettled country, is generally found byobserving, with a sextant, the Suns maximum altitude, which of course.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeography, bookyear19
