Què opinen els usuaris - Escriviu una ressenya
No hem trobat cap ressenya als llocs habituals.
Altres edicions - Mostra-ho tot
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Pàgina 2 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, etc.
Pàgina 315 - Put the centre of the quadrant of altitude on the pole of the ecliptic, and its graduated edge on the star ; then the arch of the quadrant, intercepted...
Pàgina 1 - The AXIS of the earth is an imaginary line passing through its centre from north to south. The ends...
Pàgina 310 - To find the difference of latitude of any two places. — Rule. If the places are in the same hemisphere, bring each to the meridian, and subtract the latitude of the one from that of the other; if in different hemispheres, add the latitude of the one to that of the other, and the sum will show the difference of latitude.
Pàgina 313 - Rectify for the latitude and sun's place, (Prob. vm ) and turn the sun's place to the eastern edge of the horizon, and the index will point to the hour of rising : then bring it to the western edge of the horizon...
Pàgina 14 - All that part of the territory of the United States which lies west of the summit of the Rocky Mountains, north of the forty-second degree of north latitude, known as the Territory of Oregon, shall be organized into and constitute a temporary government by the name of the Territory of Oregon.
Pàgina 314 - Double the time of the sun's rising, which gives the length of the night; double the time of his setting, which gives the length of the day. Thus, on the 25th of May, the sun rises at London about four o'clock, and sets at eight. The length of the night is twice four or eight hours; the length of the day is twice eight, or sixteen hours.
Pàgina 313 - For the zenith : screw the quadrant of altitude on the meridian, at the given degree of latitude, counting from the equator towards the elevated pole, and the globe will be rectified for the zenith.