Horizontal solar telescope

Horizontal solar telescope

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Credit: SPUTNIK/SCIENCE PHOTO LIBRARY

Caption: Solar astronomy. An astronomer working with a spectrometer in the light path of an ATsU-5 solar telescope. The telescope uses a series of open mirrors to feed light from the Sun to various instruments. Here a Newtonian mirror (top) reflects light toward a secondary mirror then into the spectrometer. The Newtonian has a diameter of 220mm and a focal length of 17.5m. This allows spectra to be obtained from small portions of the solar disc, such as prominences and sun spots. Photographed at the Georgian National Astrophysics Observatory on Mount Kanobili, Georgia, in 1970.

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