An Introduction to the True Astronomy: Or, Astronomical Lectures Read in the Astronomical School of the University of Oxford

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H. Lintot, 1739 - 396 頁
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第 49 頁 - The common names, or meaning of these words, in the same order, are, the Ram, the Bull, the Twins, the Crab, the Lion, the Virgin, the Scales, the Scorpion, the Archer, the Goat, the Waterer, and the Fishes. Fig. 183. The 12 signs of the zodiac, together with the sun, and the earth revolving around him, are represented at fig.
第 103 頁 - ... parts appear as it were toothed and cut with innumerable notches and breaks ; and even in the dark part, near the borders of the lucid surface, there are seen some small spaces enlightened by the sun's beams.
第 368 頁 - ... day of January be on a Sunday, the next year will begin on Monday, and the Sunday will fall on the seventh day, to which is annexed the letter G, which therefore will be the Sunday letter for that year ; the next year beginning on Tuesday, the first Sunday will fall on the sixth of January, to which is adjoined the letter F, which is the Sunday letter for that year ; and in the same manner, for the next following, the dominical letter will be E ; and so on. By this means the Sunday letters will...
第 104 頁 - Afterwards many more shining spaces are observed to arise by degrees, and to appear within the dark side of the moon, which before they drew near to the confines of light and darkness were invisible, being without any light, and totally immersed in the shadow. The contrary is observed in the decreasing...
第 xii 頁 - Keil observed, our author, with indefatigable pains, for more than forty years, watched the motions of the stars, and has given us innumerable observations of the sun, moon, and planets, which he made with very large instruments...
第 75 頁 - The true cause of the variation of the seasons consists in the inclination of the axis of the earth to the plane of its orbit; or, in other words, to the ecliptic.
第 65 頁 - Planets move in accordance with the law that a straight line drawn from the center of the sun to the center of any one of them, termed the radius vector, always sweeps over equal areas in equal times.
第 220 頁 - When applied to the setting of a star it denotes the entering or iminerging into the sun's rays, and thus becoming lost in the lustre of his beams. A star rises heliacally when, after it has been in conjunction with the sun, and on that account invisible, it gets at such a distance from the sun as to be seen in the morning before the rising of that luminary.
第 367 頁 - ... would constantly have fallen on the same day of the week : but now, on account, that besides the fifty-two weeks in the year, there is one day more, it happens, that on whatever day of the week the year begins, it...
第 368 頁 - ... being ranked in this order, that letter which answers to the first Sunday of January, in a common year, will show all the Sundays throughout the year ; and to whatever days in the rest of the months, that letter is put, these days are all Sundays. If the first day of January be on a Sunday, the next year will begin on Monday, and the Sunday will fall on the seventh day, to which is annexed the letter G, which therefore will be the Sunday letter for that year: the next year beginning on Tuesday,...

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