The Einstein Tower( Einsteinturm) became operational in 1924 McMath-Pierce Solar Telescope( 1.6 m diameter, 1961-) McMath-Hulbert Observatory( 24" /61 cm diameter, 1941-1979) Swedish Vacuum Solar Telescope( 47.5 cm diameter, 1985-2000) Swedish 1-m Solar Telescope( 1 m diameter, 2002-) Richard B. Dunn Solar Telescope( 1.63 m diameter, 1969-) Mount Wilson Observatory Dutch Open Telescope( 45 cm diameter,
1997-) The Teide Observatory hosts multiple solar telescopes,
including the 70 cm Vacuum Tower Telescope( 1989-) and the 1.5 m GREGOR Solar Telescope 2012-, webcam.