From 1937 to 1947 he was also the director of the Pic du Midi observatory and directed the Carte du Ciel from 1922 to 1947.
Pic du Midi de Bigorre - A mountain in the French Pyrenees famous for its astronomical observatory.
In 1965 the astronomers Pierre and Janine Connes were able to formulate a detailed analysis of the composition of the atmospheres on Mars and Venus, based on the infrared spectra gathered from these planets.
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Its name is not a direct reference to the famous astronomer Benjamin Baillaud, but refers to his son Jules Baillaud, himself an astronomer, who led the observatory of the Pic du Midi de Bigorre from 1937 to 1947.
The first instrument to be dedicated to the study of stellar magnetic fields was NARVAL, which was mounted on the Bernard Lyot Telescope at the Pic du Midi de Bigorre in the French Pyrenees mountains.