A Museum for Young Gentlemen and Ladies Or, a Private Tutor for Little Masters and Misses

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Excerpt: ...in which not only the centre of the bowl hath a progressive motion on the green, but the bowl, in going forward, turns round about its own axis. The turning of the earth on its own axis makes the differences of day and night; it being day in those parts of the earth which are turned towards the sun; and night in those parts which are in the shade, or turned from the sun. The annual revolution of the earth in the ecliptic is the cause of the different seasons, and of the several lengths of days and nights, in every part of the world, in the course of the year. If the diameter of the sun be to the diameter of the earth as 48 to 1, (as by some it is computed), the disk of the sun is above 2000 times bigger than the disk of the earth; and the globe of the sun is about 100,000 times bigger than the globe of the earth. The distance of the earth's orbit from the sun is above 20,000 semidiameters of the earth; so that if a cannon ball should come from the sun with the same velocity it hath when discharged from the mouth of a cannon, it would be 25 years in coming to the earth. We shall now consider the earth in another sense, and speak of the several divisions made by geographers. OF THE CIRCLES, Which are used by GEOGRAPHERS to explain the Properties of the NATURAL GLOBE. You may suppose the following figure to be a globe or sphere, representing the earth. The outermost circle, marked with the letters A, D, B, C, is called the meridian; and on this circle the latitude is reckoned, either from C towards A or B, or else from D towards A and B. The equator is the line C, D, which upon the globe is a circle, and is sometimes called the equinoctial: Upon this circle the degrees of longitude are reckoned, beginning at C, and counting all round the globe till you come to C again; and O is the middle of the world between A and B, which are the two poles thereof: A representing the North Pole, B the South Pole. The circles E F, and G H, are called the Tropics, ...show more

Product details

• Paperback | 44 pages
• 189 x 246 x 2mm | 95g
• United States
• English
• black & white illustrations
• 1236717767
• 9781236717764