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The Scientific Attitude of Mind
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angle angular distance apparent astronomers Big Dipper body celestial equator celestial sphere centimeters Consequently constellation corresponding craters crosses the meridian declination density depends determined diameter direction diurnal circle diurnal motions earth rotates earth's atmosphere earth's equator eastward Epsilon Lyrae equal equatorial eyepiece fact first-magnitude star focal plane follows galaxy gravity greater horizon hour circle inches interval kilometers known law of gravitation laws of motion lens lenses Lick Observatory light-years lunar eclipse Lyra magnitude mass mean solar measured meters miles moon Mount Wilson Observatory move Nebula north celestial pole object oblate observer orbit Orion period phenomena photograph plane F planets polar axis position precession radius rays refraction relative respect revolves right ascension seen sidereal Sirius solar days solar eclipses solar system spherical Suppose surface synodic month telescope temperature theory tides tion unaided eye velocity vernal equinox visible Yerkes Observatory zenith