Henri Jacques Chrétien (French pronunciation: [ɑ̃ʁi ʒak kʁetjɛ̃]; 1 February 1879, Paris – 6 February 1956, Washington, D.C.) was a French astronomer and...

scholar Chrétien Urhan (1790–1845), French musician and composer Gilles-Louis Chrétien (1754–1811) inventor of the physionotrace Henri Chrétien, (1879–1956)...

Ritchey–Chrétien telescope was invented in the early 1910s by American astronomer George Willis Ritchey and French astronomer Henri Chrétien. Ritchey...

developed by Henri Chrétien during World War I to provide a wide angle viewer for military tanks. The optical process was called Hypergonar by Chrétien and was...

furniture maker. He coinvented the Ritchey–Chrétien (R–C) reflecting telescope along with Henri Chrétien. The R-C prescription remains the predominant...

north. The irregular satellite crater Chrétien C, which shares the straight and narrow northeastern rim of Chrétien, is also covered with this dark basaltic...

photographic observations. It was invented by George Willis Ritchey and Henri Chrétien in the early 1910s. This design is very common in large professional...

contribute to safety. The reflector was first invented in 1917 in Nice by Henri Chrétien to provide the army a communication system the enemy could not intercept...

without glasses. President Spyros Skouras struck a deal with the inventor Henri Chrétien, leaving the other film studios empty-handed, and in 1953 introduced...

his modest and solitary attitude. Born in Paris to Henri and Anna Chrétien, Chrétien was raised in an agnostic household. His father was a communist activist...