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according accuracy altitude angle angular appear ascertained astronomers atmosphere attraction axis bodies called cause celestial centre circle circular comet compared computed consequently considerable considered continued declination described determined diameter direction disc discovered distance divided earth ecliptic effect equal equator equinox error exact explained fixed stars follows force give given greater greatest Hence horizon inclination increase inferior interval Jupiter known latitude length less light longitude lunar magnitude mass mean measured Mercury meridian method miles minutes moon moon's motion move nearly necessary node object observed obtained opposite orbit parallax parallel passing periodic planet pole position present produced proportion rays refraction respect revolve right ascension rising rotation round satellites Saturn seen shadow shown side solar space sphere sun's supposed surface tables telescope tion transit true Venus vertical visible
Seite 10 - Declination is either north or south, according as the object is on the north or south side of the equator. North declination is generally regarded as positive, and south declination as negative.
Seite 278 - ... a vacuum, without the mediation of anything else, by and through which their action and force may be conveyed from one to another, is to me so great an absurdity, that I believe no man who has in philosophical matters a competent faculty of thinking, can ever fall into it. Gravity must be caused by an agent acting constantly according to certain laws ; but whether this agent be material or immaterial, I have left to the consideration of my readers.
Seite xiii - It is shown in astronomy that the elevation of the celestial pole is equal to the latitude of the place, and...
Seite 82 - The node through which the planet passes from the southern to the northern side of the ecliptic, is called the ascending node, and the other the descending node.
Seite 62 - ... that the squares of the periodic times of the planets are proportional to the cubes of their mean distances from the sun.
Seite 231 - ... yards, and in latitude 50° = 121,413. Thus the degrees appeared to diminish as the latitude increased, instead of the contrary. For it is evident that if the curvature of the earth diminish as we recede from the equator toward the poles, the degrees of latitude ought to increase, because the less the curvature, the greater space must be gone over to change the elevation of the pole by one degree. This result therefore appeared to contradict Newton's conclusion, that the earth was nearly an oblate...
Seite 197 - ... the squares of the periodic times are as the cubes of the distances from the common centre, the centripetal forces will be inversely as the squares of the distances.
Seite 189 - ... its disadvantages. One is, the great exactness requisite in observing the distance of the moon from the sun or star, as a small error in the distance makes a considerable error in the longitude. The moon moves at the rate of about a degree in two 1 92.
Seite 233 - ... yards. The measurement in England, which was begun with a reference only to the relative situations of the observatories of Greenwich and Paris, was extended to a survey of the whole kingdom. This, General Roy having died, was conducted by Colonel Mudge, with great skill and assiduity. In the course of his survey, in the year 1801, he measured an arc of the meridian, between Dunnose in the Isle of Wight and Clifton in Yorkshire. The difference of latitude (nearly three degrees) was ascertained...