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THE HISTORY OF ASTRONOMY
I1 ASTRONOMICAL QUANTITIES AND MEASUREMENTS
in AN OUTLINE OF ATOMIC THEORY
6 other sections not shown
accurate angle appear Aries asteroids astronomical atmosphere atom axis bright brighter calendar centre chromosphere circle clouds clusters colour comet constellations corona crater dark degrees density diameter disc distance dwarf Earth Earth's atmosphere Earth's surface eclipse electrons energy Equator fixed stars Fraunhofer lines Galaxy giant globular clusters gravity Greek heavenly bodies helium horizon hundred hydrogen ionised Jupiter known layer light light-years lines luminosity lunar magnitude major planets Mars mass measurement Mercury meridian meteors miles Milky million month Moon Moon's move nebulae nucleus observed occur orbit parallax parsecs particles path period photographic photosphere planetary Pluto Point of Aries Pole position proper motion protons radiation rays rotation round the Sun Saturn seconds of arc seen shown shows Sirius Solar System space spectra spectral types spectrum speed sphere stellar Sun's sunspots telescope temperature theory Uranus velocity Venus visible wave-length Zodiac