Harvard University is an Ivy League university established in 1836. The Harvard College Observatory was established by an official act of the Corporation in October 1839. The four buildings across from the Radcliffe Quad on Garden Street house the Department of Astronomy, Harvard College Observatory, and the Smithsonian Astrophysical Observatory. The Observatory houses three libraries and the largest collection of astronomical photographs in the world. All discoveries of comets must be reported to the Harvard College Observatory. In addition, the leading popular astronomical magazine, Sky and Telescope, is published at the observatory.