Elements of Plane And Spherical Trigonometry With the First Principles of Anal
Elements of Plane And Spherical Trigonometry With the First Principles of Anal
James B James Bates Thomson
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(11) In like manner, if a secondary to the ecliptic be drawn through any point of the sphere, the part of it between'the point and the ecliptic is called the latitude of the point ; and (12) the part of the ecliptic extending eastward from the first point of Aries to the secondary, is called the longitude of the point. This was formerly reckoned in signs of 30 each, and of which the ecliptic must therefore contain twelve. It is now reckoned in degrees. G8 ASTRONOMICAL AND GEOGRAPHICAL DEFINITIO...NS. 166. Given the obliquity of the ecliptic, and the right ascension and declination of any of the heavenly bodies ; to find its latitude and longitude. In geography, (13) a secondary to the equator passing through anyplace, is called the meridian of that place ; and ( 14) the lont/itude of a place is the smal- ler of the two parts into which the equator is divided by" the meridian of the place and the first meridian, that is, the meridian from which geographers have agreed to reckon the longitude.
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