High Quality Content by WIKIPEDIA articles! Ground-based professional observatory telescopes at optical wavelengths in a chronological list. Solar telescopes often have multiple focal lengths, and use various combination of mirrors (such as coelostats), lenses, and tubes for instruments including spectrographs, cameras, or coronographs. There are many types of instruments that have been designed to observe Earth's Sun, but in the 20 century Solar towers were common.

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