EXPL ANATION and USE

O F THE

Solar and Lunar Tables.

USE OF THE TABLES OF THEEQUATION

OF TIME.

Page ii. and m.

PROBLEM I.

To convert apparent time into mean time, and the contrary.

S I N C E the place of the Sun’s apogee does not remain fixedin the fame point of the ecliptic, but goes forward i\ 6"every year, and confequently about a degree in 5 5 years, thefame equation of time will not ferve accurately for many years con-tinuance. To remedy this defect, we have here given two tables,one adapted to the i6th year of this Century, at which time theSun’s apogee was in 8° s , the other to the year 1771, when theapogee will have got into 9 0 $. Whence the equation of time maybe readily found by proportion ; and that with sufficient accuracy,not only for any intermediate year, but also for thofe preceding and

B b following,