Percival Lowell Milan Observatory. In 1894 Lowell chose Flagstaff, Arizona Territory, as the home of his new observatory. At an altitude of over , with few cloudy nights, and far from city lights, Flagstaff was an excellent site for astronomical observations. This marked the first time an observatory had been deliberately located in a remote, elevated place for optimal seeing. For the next fifteen years he studied Mars extensively, and made intricate drawings of the surface markings as he perceived them. Lowell published his views in three books: "Mars" (1895), "Mars and Its Canals" (1906), and "Mars As the Abode of Life"
Perkins Observatory in the United States. Currently it is one of the three largest telescopes in Ohio. In 1964, three years after the Perkins Telescope arrived at Lowell Observatory, the mirror was replaced. A new mirror made of a more modern material was installed in the old mount. The old mirror was loaned to COSI in Columbus as an exhibit. Part of the arrangement between OSU, OWU, and Lowell Observatory called for Ohio State to continue to fund operations at Perkins Observatory. This included maintaining the building, the library, and the monthly public programs. However, over the following decades, without a research