Maurice Loewy (French, 1833-1907) and Pierre Henri Puiseux (French, 1855-1928)
Maurice Lowey was born on April 15, 1833 in Marianske Lazne, in what is now the Czech Republic. Lowey moved to Vienna in 1841 to become an assistant at the Vienna Observatory, working on celestial mechanics. In 1860, the director of the Observatory, Karl L. Littrow, secured a position for Lowey under Urbain Le Verrier, the director of the Paris Observatory. There he worked on the orbits of asteroids and comets and on the measurement of longitude, improving the accuracy of the Connaissance des Temps. He was elected a member of the Bureau des Longitudes in 1872 and of the Academie des Sciences in 1873. In 1896, Loewy became the director of the Paris Observatory reorganizing the institute and establishing a department of physical astronomy.
Pierre Henri Puiseux was born on July 20, 1855, in Paris. He was educated at Ecole Normale Supérieure before starting work as an astronomer at the Paris Observatory in 1885. Piuseux started in 1885 as the assistant astronomer, and then was promoted to head of astronomy in 1903. He studied secular acceleration of lunar movements, the movements of asteroids, and determined the constant of stellaraberation. Puiseux also devoted his time to the University of Paris where he was a professor of astronomy and mechanics.
Maurice Lowey and Pierre Puiseux meet and began a study, which lasted a decade, on an atlas of the moon composed of 10.000 photographs, L'Atlas photographique de la Lune (1910). This general map of the Moon's regions was perhaps the crowing achievement in lunar photography of the 19th century. Their striking photogravures display the results of the accomplishments of early astronomical photographers.