Popular Scientific Recreations in Natural Philosophy Astronomy Geology Chemis
Popular Scientific Recreations in Natural Philosophy Astronomy Geology Chemis
Gaston Tissandier
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c Fig. 503. Right angles. CHAPTER XXXIV. ANGLES AND MEASUREMENT OF ANGLES. THE QUADRANT TRANSIT INSTRUMENT CLOCKS STELLAR TIME SOLAR TIME " MEAN " TIME. WE must say a few words respecting the various instruments and aids to astronomical observation before proceeding, for astronomy requires very accurate calculations; and though we do not propose to be very scientific in our descriptions, some little idea of the manner in which obsrvations may be made is necessary. The first thing to see about i...s the ANGLE. Suppose we draw four lines on a piece of paper, ab and cd. These intersect at a point, m. We have then four spaces marked out, and called angles. The four angles are in the diagram all the same size, and are termed right angles, and the lines containing them are perpendicular to each other. But by altering the position of the lines (see fig. 504), we have two pairs of angles quite different from right angles ; one angle, a' m c' ', is smaller, while a m d' is much larger than the right angle.
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