A Treatise Describing the Construction, and Explaining the Use of New Celestial and Terrestrial Globes: Designed to Illustrate, ... the Phoenomena of the Earth and Heavens, ... By George Adams, ...

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sold, 1777 - 359 páginas
 

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Página 80 - ... the colures are two great circles, intersecting each other at right angles in the poles of the world, and encompassing the earth from north to south, and from south to north again...
Página 4 - The plane of the equator is inclined to the plane of the ecliptic at an angle of 23° 27' 34"'69 ; and the inclination of the lunar orbit to the same is 5° 8
Página 334 - Science which contemplates the Powers of Nature, the Properties of Natural Bodies, and their mutual action one upon another.
Página 141 - If the latitude be north, bring the beginning of Cancer to the brafen meridian, and elevate the north pole to about 66|- degrees; but if the latitude be fouth, bring the beginning of Capricorn to the meridian, and elevate the fouth pole to about 66| degrees ; becaufe the longeft day in north latitude, is when the fun is in the firft point of Cancer ; and in fouth latitude, when he is in the firft point of Capricorn. Then fet the hour-index to XII at noon, and turn the globe weftward, until the index...
Página 16 - ... throughout the whole diurnal revolution, at which time the inhabitants of those places have the sun more than twenty-four hours above the horizon. This happens at the time of our summer solstice, or about the 21st of June, at which time the south polar circle, dm, is in darkness. While the earth is moving from Libra, through Capricorn, to Aries, the north pole, P, being in the illuminated hemisphere, will have six months continual day ; but while the earth passes from Aries, through Cancer, to...
Página 283 - TWo fides and an angle oppofite to one of them being given, To find the third fide and either of the other angles.
Página 42 - ... discoveries ; there are also many additional circles, as well as the rhumb-lines, for solving all the necessary geographical and nautical problems. On the celestial globes, all the southern constellations, observed at the Cape of Good Hope by M. de la Caille, and all the stars in Mr. Flamstead's British Catalogue, are accurately laid down and marked with Greek and Roman letters of reference, in imitation of Bayer. Upon each side of the ecliptic are drawn eight parallel circles, at the distance...
Página 152 - ... fet the :north pole of the globe towards the north pole of the heavens. The ftar upon the globe (if you conceive yourfelf in the center) which directs towards that point in the heavens, in which the ftar you want to know is feen, is the ftar required. At the fame time, by comparing the ftars in the heavens with thofe upon the globe, the other ftars and their conftellations may be eafily known ; whereby you will be enabled any ftar-light night, to point out I 4 many many of thofe ftars called...
Página 36 - Therefore, the distances of the Moon from the Earth and of the Earth from the Sun are constantly varying.
Página 152 - London is between 20 and 21 deg. from the north, weftward, fet the north pole of the globe towards the north pole of the heavens. The ftar upon the globe (if you conceive yourfelf in the...

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