Demonstrations of methods of astronomical calculation by George Councer, using the following calculations as examples: (fols. 1-10) the time of the new moon in 1748; (fols. 10-163) an eclipse of the sun in 1748; (fols. 166-201) the transit of Venus over the sun in May 1761; (fols. 202-284) the transit of Venus over the sun in 1769; ...