^^'This laft Table of the itquation of Natural Days 
might have been fpared, as being publiflit in feveral 
other places, but it was thought proper to have aD the 
Elements of this Calculus together, that there might be 
no Qccafion of any other Book to perform ir. 
The Z)fe of the tables, 
\ Jhi ci^ gtveft Tfaty Month, and Day^ to find tin nest 
Ecltpje of the firH Satellite of Jupiter, . , 
• i: Tn the Table of Epochte Qpag, 240. j had the Ye^r 
of our Lord, and fet down the Day, Hours, Minutes, 
and Seconds, with the Num. I. and Num. If. thereto 
aiinext; and (in pag, 141 and the following) fcqk the 
Month, and day of the Month, with the Hours ^pnd 
Minutes, and Num. T. and II. affixt, and add them to- 
gether : and the refpeftive Sums {hall Ihew the mean 
time of the middle of the Eclipfe fought, with Num. I. 
and Num. II. required. But it muft be obferved, that in 
January and February in the Leap-Year one Day is to be 
added to the Day thus found. 
II. If Num. I. be found lefsthan 11x4 with Num.1; 
or if greater thanx448,SubftraftiDg 2448 therefrom, with 
the refidue, enter the Table, pag, 245. and yo» will have 
the jfirft .^Squation to be added to the mean Time before 
found. But if Num. I. be lets than 2448, but grater 
than 11x4, Subftrad it from 2448, and entring the 
(ame nable with the remainder, you fliali have the firft 
j^quation to be fubjira^ed from the mean Time. Thj^i 
Divide the Minutes of the faid firft itquatroa by fi, 
or rather 'r, and the Quote (hall be the ^Equation of 
Num. II. ( anfvvxring to the Eccentrick Motion of Jupi- 
ter) to added thereto when the firft ^Equation 5«^- 
Jlrdls^ and e contra fuhjlralled wheo that adds. 
'""'^^ m.if 
