The planetary instrument. Or The description and use of the theories of the planets : drawn in true proportion, either in one, or two plates, of eight inches diameter; by Walter Hayes, at the Cross-Daggers in Moor-Fields. Being excellent schemes ot help the conceptions of young astronomers; and ready instruments for finding the distances, longitudes, latitudes, aspects, directions, stations, and retrogradations of the planets; either mechanically, or arithmetically; with ease and speed. By Mr. John Palmer, rector of Ecton, and arch-deacon of Northampton.