Rare Books

A help to calculation. Or Two tables: : the one of decimal numbers, and the other of their logarithmes, for the ready converting of sexagenary tables into decimal, and the contrary. And for the finding of the part proportional in all sexagenary tables. As also tables of declination, right and oblique ascensions, ascensional difference, and other tables of the primum mobile, for the speedy and exact erecting of a figure: in all which the use of the former tables in taking the part proportional will appear