The Movements of the Earth

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Macmillan, 1887 - Earth - 130 pages
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Page 111 - England is seen to lie near to the centre of the hemisphere ; while in Fig. 48, representing the conditions at the winter solstice, England is so near the edge that it cannot be properly represented. This experiment then will enable us to go further, and to say that the plane of the earth's equator, and therefore of the earth's spin, is not parallel to the plane of the ecliptic, but is inclined to it at an angle represented by the difference between 90 and 66, or 90 and 113 ; that is to say,...
Page 101 - October 5 an apparent diameter of 32' 5"'I7. In this latter case we have a difference only of f'oi ; in the former case a difference of over 2', so that the Greenwich observations quite justify the supposition that the earth moves, not in a circle, but in an ellipse ; because, the greater the distance of the sun from the earth, the smaller it must appear. While we are on this subject of the ellipticity of the earth's orbit, I am anxious to draw your attention to the two diagrams, so that the matter...
Page 51 - Then by dividing this result by something a little over 3 (3-1416, the ratio of the circumference of the circle to its diameter), we find out how far it is from one side of the earth to the other. This gives us the diameter of the earth. As a result of a long series of observations, which, however, we cannot discuss here, it has been found that a degree measures as near as possible.
Page 96 - ... be pointed in four different directions with regard to the star. For instance, if we take a point at c, where the earth is travelling in the direction of the arrow, and the point at which the star would be seen if the earth were at rest, or the velocity of light were infinite, be indicated by the star in the figure...

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