54 UNIVERSAL ERUDITION-. 



culuing, according to this decree, which is fol- 

 lowed by all Chriiban nations, the day of the 

 year on which Eafter will always fall j as well 

 in the Gregorian as Julian calendar. 



XXX. Laftlv, this part of chronology teaches 

 the method of conflicting a complete calendar, 

 as follows : i. To find the feaft of Eafter, and 

 the dominical letter. 2. To divide the calendar 

 into weeks, and regulate the moveable feafts by 

 that of Eafter; inferting at the fame time the im- 

 moveable feaits, with the names of thofe faints 

 that are appointed for each day. 3. To extrad, 

 from thofe tables that are called Ephimeres, the 

 place of the fun and moon in the zodiac, as well 

 as of the other planets ; to find the rifing and fet- 

 tingof the two former, the duration of the twi- 

 light, and the length of the days and nights ; 

 and to infert all thefe matters in their proper 

 places. 4. To remark when a planet is vifible 

 to us, and when it is hid by the fun's rays. 

 5. At the beginning of each month to make ob- 

 fervations on the feafons, and to give account of 

 the eclipfes of the fun and moon, and of other 

 celeltial phenomena. 



XXXI. Thus far we have treated of mathematic 

 chronology. We fhall now, in as brief a manner as 

 poffible, make the analyfis of hiftoric chronolo- 

 gy, or of that fcience which teaches to tliftin- 

 guifh the feveral events related in hiftory accord- 

 ing to the order of time in which they hap- 

 pened. 



