MATHEMATICS

 

                             Problem XX.

     To find on what day Easter will happen.

Find the age of the Moon on the 21^st of March

in the given year; if it be 14 then find the day

of the week answering to it, and the Sunday

following is Easter Sunday; but if the Moon's

age on the 21^st of March be not 14, then

reckon forward to the day on which the Moon's age

is 14, and find the day of the week answering to

that day, the Sunday following will be the day

required.

     NB.  On leap year take the 20^th of March.

Example.  When does Easter happen in the year 1786.

            21 of March                             ny 44                                       31

            29 Exact                                   Take31= days in March          28

            1 No. of the month    13^th of April, the                      31

            51                                            day of the full moon               13^th

subtract 30                                          or, Easter Limit.                     7) 103

            21 Moon's age                                                                        14-4'=

          +23 

car. up 44  No. of days to the Moon's

Add     23    being 14 days old.

Therefore, the 1^st of Jan. being Sun.,

reckon forward 5 days including Sun.,

and you find the 13^th of April falls on Thurs.

consequently the next Sun. is the 16^th,= Easter Sun.