Great refractor
- Alvan Graham Clark
- Amalthea (moon)
- Astrograph
- Berlin Observatory
- Carl August von Steinheil
- 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
- Newall Telescope
- Non-achromatic objective
- Paris
- Paris inch
- Pendeli
- Percival Lowell
- Pierre-Louis Guinand
- Tartu Observatory
- Thomas Grubb
- Venus
- Vienna Observatory
- World's Columbian Exposition
- World's fair
- Yerkes Observatory