Plutarch On the Face Which Appears On the Orb of the Moon : Translation And Notes, With Appendix
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There is left then that of Empedocles, 2 9 that the illumination which we get from the Moon arises in some way from the reflexion of the sun falling upon her. Hence her light reaches us without heat or lustre, whereas we should expect both if there were a kindling by him or a commixture of lights. But as voices return an echo weaker than the original sound, and missiles which glance off strike with weaker impact, ' E'en so the ray which smote the Moon's white orb ' reaches us in a feeble and ex...hausted stream, because the force is dispersed in the reflexion." XVII. Here Sylla broke in:— "All these things no doubt Sylla. have their probabilities ; but the strongest point on the other side was either explained away or it escaped our comrade's attention : which was it ? " "What do you mean?" said Lucius. "The problem of the Lucius, half-moon I suppose?" " Precisely," said Sylla, " for as all reflexion takes place at equal Sylla. angles, there is some reason in saying that when the moon is on the meridian at half-moon, the light is not carried from her on to the earth, but glances off beyond it ; for the sun being then on 930- the horizon, touches the Moon with his rays, which will therefore, being reflected at equal angles, fall on the other side and beyond us, and will not send the light here ; or else there will be a great distortion and variation in the angle, which is impossible." "I assure you," said Lucius, "that point was mentioned also;" Lucius and here he glanced at Menelaus the mathematician, as he went on : — " I am ashamed, dear Menelaus," he said, "in your presence to upset a mathematical proposition which is assumed as a founda- tion in all the Optics of Mirrors.
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