Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 280
equinoctial year. Whichis the longer? What does that prove? Will Polaris always be ourpole-star? What is the cause of precession? What three greatnames are connected with the discoveries regarding precession ? andat what dates ? How was it first proved that light required time topass from place to… … Fig 157.—Effects of Aberration. CHAPTER XIV.CELESTIAL MEASUREMENTS OF MASS AND DISTANCE. 29. The Celestial Scale of Measurement.—The units oflength and mass employed in Astronomy are necessarilydifferent from those used in daily life. The distances andmagnitudes of the heavenly bodies are never…
Astronomy
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