Great refractor

• Alvan Clark & Sons
• Alvan Graham Clark
• Amalthea (moon)
• Astrograph
• Berlin Observatory
• Carl August von Steinheil
• Charles Feil
• Chester Moore Hall
• Comet Seeker
• Crossley Reflector
• David Dunlap Observatory
• Dearborn Observatory
• Dominion Astrophysical Observatory
• Edward Joshua Cooper
• Estonia
• Filar micrometer
• Governorate of Estonia
• Great Exhibition
• Great Industrial Exposition of Berlin
• Great Paris Exhibition Telescope of 1900
• Griffith Observatory
• Halley's Comet
• Heliometer
• Hubble Space Telescope
• Hugh Percy, 3rd Duke of Northumberland
• James William Grant (astronomer)
• Johann Gottfried Galle
• John Dollond
• Joseph von Fraunhofer
• Leviathan of Parsonstown
• Léon Foucault
• Meridian Circle
• Meudon Great Refractor
• Meudon Observatory
• Mount Wilson Observatory
• Non-achromatic objective
• Paris
• Paris inch
• Pendeli
• Percival Lowell
• Tartu Observatory
• Thomas Grubb
• Venus
• Vienna Observatory
• World's Columbian Exposition
• World's fair
• Yerkes Observatory
• achromatic lens
• achromatic telescope
• aerial telescope
• discovery of Neptune
• equatorial mount
• figuring
• focal length
• gravity
• heliometer
• lens sag
• moons of Mars
• parallax
• primary mirror
• reflecting telescope
• refracting telescope
• short ton
• siderostat
• speculum metal