MEMOIR EXPLANATORY OF A NEW PERPETUAL CALENDAR. 



1 25 



SUPPLEMENTAL RULES 



EXTENDING AND FACILITATING THE USE OF THE FOREGOING TABLET. 



1st. A Rule for Julian Years before Christ, back to tht re mud si Epoch. 

 From any multiple of 532, preferring the multiple next greater than the given Year, 

 Subtract the given Year B. C. less 1, (but the year itself, if denoted astronomically.) 

 The Difference will be a Julian Year after Christ holding a corresponding place with it 

 in the Dionysian Pt riod, (or product of the solar cycle of 28, by the lunar cycle of 19 years,) 

 Then the foregoing Rules applied to the Year after Christ, thus found, must yield both 

 the Days of the Week and the Epact, correctly, for the given Year before Christ. 

 [fthe year after Christ be a multiple of 4, the year before Christ, (though an odd number) 

 is also a leap year. 



EXAMPLES. 



Il'hat day of the week wan May the 28th in the 585/A 

 Tear Is. C, Old Style? 

 532 x 2 = 1004 

 585—1 = 58 I 



I Inference 180 or like year after Christ. 



One fourth part, 120 

 I in column A 5 

 No. for Mav, Table I? 1 

 Day of Month 28 



Divide by 7) 634 



Remainder 1 or Wednesday. 



(See Article " Cycle," in Rees's Cyclopedia.) 



It is a Leap Tear, and its Epact will be found, 



by the Tablet, to be 25. 



Jf'hat day of the week was January tin 1st, in the 

 Year 6857, B. C.9 reckoned aa oily.) 



532 x 13 = 6916 



0857 



59 or like year after Christ. 



Divide by 7) 79 



Remainder 2 or Monday. 



See Delambre, who says "that year begins and 

 on Monday." It is, of course, common, and its Epact 

 will be found to be 22. 



2iL A Kuli fur Yrttrs of the Julian Period, or (A. J. P.,) both before and after Christ. 



c.-j 



0. )■ = the Year of the Julian Period (or A. J. P.) 

 D.J 



f 471 1 li I igical Year P. 



-< 1713 less the Astronomical Year B. 

 I 1713 added to the Year of Christ A. 



To A. J. P. add 19, or from A. J. P. deduct 9? ,. ., n ._ 



To A. J. P. add 18, or from A. J. P. deduct 1 $ and t0 lhe ' S " m 0r D >ff crtnce > as » " »■» J J»l"'» A. D., 



Apply 5 J e r| viI , 5 u | e \ of 'he Tablet for finding $ j! 10 ^Y °/ 'J'" Week, or Feria. ? 

 11 ' t the Church Rule 3 6 ( the aye o! the Moon, or Epact. } 



The Sum, or Difference lessened by any multiple of 532 (such as 3721 ) yields the same answers. 



EXAMPLES. 



A. J. P. 3938 July 1st, year P. C. 776 Chronological Epoch of the Olympiads, Feria 2 or Monday, Epael I 1. 



28 

 I 

 I- 

 25 

 23 

 29 

 1 



3961 \;>ril 21, 

 r Feb. 26, 

 1104 Sept. 30, 

 1129 May 28, 

 4669 Jan. 1 , 

 4713 Jan. 1, 

 5335 July 16, 



Ex. first, L .1. I'. 3938 

 A. J. P. 3988 



753 " " Rome 



"7 17 " " Nabonassar 



" G10 Eclipse predicted by Thalea (F. Bailj ) 



" 585 Eclipse Art. "Cycle," Rees's Cyclop. 



" II Ri i"rm. Cal. of Jul. Cesar (bissextile) 



" I, <ir Year of Astronomers (bissextile) 



\. I). 622 Epoeh of the Begin 



C 19 = 3957 A. I>. . . . C3957? wm . / roo _, 1238A. D, 



" r , is = 8956 A. I). \ An<1 \ 3956 \ ~ • i724 ( or 532 * 7 ) = J 232 \ I >. 



5 9 = 8929 \. I). ; . . C3929? __, . , _ M ^ C206A.D. 



- j 1 = 3987 I. D. J A "' 1 ? 8987 \ ~ AVZi ( or BM * *> " ? 218 A. D. 



4 

 6 

 4 

 6 



6 

 6 



Mou 



\\ nlncs'yi 



Frid 



Wednes-'y, 



Friday, 



Thursday, 



Friil 



