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anco appear arranged astronomers atmosphere boundary bright brighter cavities centre circle circumference Copernican system dark darker diameter discoveries distance from Jupiter Earth Earth's atmosphere east side eccentric ecliptic epicycle exactly fifth hour fixed stars GALILEO GALILEI Giove heavens hour the satellite illuminated Illustrissima e Reverendissima instrument intervals Kepler Kepler's Dioptrics larger length letters LICK OBSERVATORY light line with Jupiter lunar magni magnitude Mars Medicean middle satellite Milky molto Moon Moon's surface motion mountains nearer nearest satellite nearest to Jupiter nearly night observations orbit phenomena Pianeti planet portion position Ptolemaic system quale rest satel satellite furthest satellite nearest satellites and Jupiter Saturn seen shadow shine side of Jupiter Sidereal Messenger Sidereus Nuncius sight Signoria Illustrissima sixth hour smaller sphere spots stationary points straight line drawn Sun's rays telescope three satellites tude Tycho Brahe universe visible west of Jupiter western satellite