History (see Discoveries Below)
Aside from the wide array of research and discoveries listed below, one science program carried out at the Observatory was the measurement of the variability of solar irradiance. When Harold L. Johnson took over as the director in 1952, the stated objective became to focus on light from the Sun reflecting from Uranus and Neptune. In 1953, the current 21-inch telescope was erected. Beginning in 1954, this telescope began monitoring the brightness of these two planets, and comparing these measurements with a reference set of sunlike stars.
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13" Astrograph used to discover Pluto
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Alvan Clark Refractor Telescope, the first permanent telescope at Lowell Observatory
Read more about this topic: Lowell Observatory
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