Construction of the observatory began in 1878, and the 8 meter dome was completed in 1908. It housed a mechanical equatorial reflector. In 1946 Mr. Gentilli funded a dome and 60 cm, and in 1958 a spectrograph was installed. A 106-centimetre (42-inch) telescope was installed in 1963 funded by NASA, and was used to take detailed photographs of the surface of the Moon in preparation for the Apollo missions. A new 2 meter telescope, known as the Bernard Lyot Telescope was placed at the observatory in 1980 on top of 28 meter column built off to the side to avoid wind turbulence affecting the seeing of the other telescopes. It is the largest telescope in France.
Mountains, Scientific - Astronomy