Louis Thollon
Louis Thollon (May 2, 1829 – April 8, 1887) was a French astronomer.
He was born in Ambronay, France.[1] Beginning in 1881, Thollon joined the staff of the new Nice Observatory where he undertook a long-term observation program of the Sun using a spectroscope of his own design.[2] In the process, he recorded a solar spectrum consisting of 3,000 absorption lines in the optical band.[3]
In 1882, he joined André Puiseux on an expedition to Egypt to observe the solar eclipse on May 17.[4] The same year he traveled to Portugal to watch the Venus transit, but met with disappointment.[5] During the 1886 Mars opposition, he assisted the observatory director, Henri Perrotin, in observing the planet with a 15 in (38 cm) reflecting telescope. Both men reported that they spotted canali on the surface of the planet, apparently confirming the 1877 discovery of these features by Italian astronomer Giovanni Schiaparelli.[6] Thollon died in Lyon, France.[1]
References
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