In 1725 Flamsteed's own version of "Historia Coelestis Britannica" was published posthumously, edited by his wife Margaret. This contained Flamsteed's observations, and included a catalogue of 2,935 stars to much greater accuracy than any previous work. This was considered the first significant contribution of the Greenwich Observatory. In 1729 his wife published his "Atlas Coelestis", assisted by Joseph Crosthwait and Abraham Sharp, who were responsible for the technical side.