The first . Ancient astronomy . Astrology . Calendar. Copernicus. Tycho Brahe . Kepler . Galileo . Newton. World Gravity. Part 2 . Practical Astronomy . Viewing tube. Pipe fittings. Reflectors and refractors. Opening of the Worlds . Photo by . Astrophysics . Part Three . Heavenly Sphere . Constellations and groupings of stars. Infinity of the Stars . Distance . Nature of the Stars . New and Variable Stars . Double and multiple stars . Star clusters. Part Four . Sun. Moon. Tides and ebbs. Eclipses. Topography of the Moon . Group of inner planets: Mercury. Venus . Mars. Group of outer large planets: Jupiter. Saturn. Uranium. Neptune. Comets . Physical Device of Comets . Meteors and Falling Stars .