Astronomical observations made at the Royal Observatory at Greenwich, in the years 1765, 1766, 1767, 1768, and 1769. [electronic resource] : By the Reverend Nevil Maskelyne, B.D. Fellow of Trinity College, Cambridge, and of the Royal Society, and Astronomer Royal. Published by the President and Council of the Royal Society, at the public expence, in obedience to His Majesty's Command