Part of the computations of Charles Mason's lunar tables of 1778, including comparisons of the tables of the Moon in longitude and latitude, with observations. The volume includes tables on the annual equation of the anomaly and ascending node of the Moon, details of the Moon's longitude, corrections and reductions. There are computations of the Moon's longitude and latitude as compared to Johann Mayer's tables, 1751-1760; computed longitude of the Moon compared with observed longitude, 1750-1760; and remarks on this subject given to the Board of Longitude, 1750-1760. There are also Mason's equations of the computed latitude of the Moon that differs from the observed, 1750-1760.