We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
20 to revolve continuously around it. They are seen to move forwards for some time, then to become nearly stationary, and then to move backwards; they are then again nearly stationary, and again begin to move for- wards. This phenomenon is called the direct and retrograde motion of the planets, and is explained by DIAGEAM XY. Suppose A to he the Earth remaining stationary, and b to be one of the inferior planets, Mercury or Yenus; it will he seen among the fixed stars at B. As it moves on to c, it will gradually change its place in the heavens to C, and when it arrives at d it will be seen at D, where it will appear to remain stationary for a short time. As the planet moves towards e, it will appear to return to C, and will be seen in the same situation as when at c. As it moves along <?,/, g, h, it will appear to take the direc- tion C, B, G, IT. When at k it will again appear sta- tionary ; and as it moves along towards i and b, it will again appear to move in the direction H, G, B. The motion of the Earth will occasion a slight difference in these appearances, but the diagram sufficiently explains the cause of them. This diagram also shows why Mer- cury and Yenus are never seen at a great distance from the Sun. For the Sun’s place among the fixed stars will be at B, and the planet will never appear to move farther on either side than H, or D, which two periods are called the times of its greatest elongation. The two situations b and/, are termed the conjunction and the opposition. The apparent diurnal revolution of the Sun, Moon, and Stars around the Earth, is caused by the Earth’s rotation on its axis ; and the change of place of the Sun among the stars, is caused by the Earth’s revolution around him. The path in which the Earth moves, as seen from the Sun, and in which the Sun appears to us to move, 15 called the Ecliptic. The stars which are seen at a little