Manual of Science for Teachers Containing Answers to the Practical Questions a
Manual of Science for Teachers Containing Answers to the Practical Questions a
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What is meant by the "mean distance" of a planet ? The "mean distance" is the average distance. 116 ANSWERS TO PRACTICAL QUESTIONS 38. What keeps the earth in motion around the situ ? (See Astronomy, p. 22. ) According to the First Law of Motion, "Every body con- tinues in its state of rest or of uniform motion in a straight line, except in so far as it may be compelled by impressed forces to change that state. " . 7. 9. Do we ever see the sun after it sets ? (Sec Astronomy, p. 114. ) The refra...ction of the atmosphere tends to raise all objects toward the zenith, and, at the horizon, this is no less than 35', or 3' more than the mean diameter of the sun (32'). 40. When does the earth move the most rapidly in its orbit ? (See Astronomy, p. 18. ) The earth moves most rapidly in perihelion. 4:1. Have ive conclusive evidence that any planet is in- habited ? (See Astronomy, p. 61; also note, p. 297. ) May it not be that the same lavish hand that scatters flow- ers and seeds in such profusion (not one in a thousand coming to the perfection and end of its being), sows space with worlds, a few only reaching the full fruition of life ?
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