49 s 



TRANS. ST. LOUIS ACAD. SCIENCE. 



Median, Persian. Greek, Egyptian, and Roman regents, succes- 

 sively enumerated in Ptolemy's Historical Canon, occur in Bibli- 

 cal, Greek, and Roman histories ; and since the principal epochs 

 of the latter have been, in the premises, fixed by a multitude of v 

 infallible historical and astronomical certainties, it will be an easy 

 matter to decide the question to what years the 19 eclipses in the 

 Almagest really belong. In advance we put in juxtaposition the 

 successive regents according both to Ptolemy's Historical Canon 

 and his Nabonassarian Era on one side, and on the other their 

 epochs according to other chronological resources, especially the 

 Greek ones (pp. 470-72). It is to be remembered that the basis 

 of Ptolemy's Narbonassian Era is the vague year of the Egyp- 

 tians, which every four years commences earlier by one Julian 

 day, and that Ptolemy in general referred, as Ideler says, the last 

 months of a king subsequent to the newyears day to the reigning- 

 time of his successor. Freret, on the contrary, maintained that 

 Ptolemy referred the first months of the Babylonian kings preced- 

 ing the newyears day to the reigning-years of his predecessor. 



Nabonassar 



Mardokempad's first year 



(1) 5 Ec. March 19. 

 Mardokempad's 2d year 



(2) j) Ec. March S. 



(3) ]) Ec. September I. 

 Nabopolassar 



(4) J) Ec. during his 5th year. 

 Nabokolassar (Nebuchadnezzar) 



Babylonian captivity, 2 Kings xxv 



Nabonnad (Belshazzar) 



Cyrus 



Cambyses 



(5) J) Ec. during his 7th year. 

 Darius (Hystaspes) 



(6) j) Ec. during his 20th year. 



(7) j) Ec. during his 31st year. 



Xerxes 



Artaxerxes (Longimanus) 



Darius (Nothus) 



Artaxerxes (Mnemon) 



(8) j) Ec. 381, December 12. 



(9) D Ec. 3S0, June 6. 



(10) J) Ec. 380, December 1. 



Ochus 



Arses (Arogus) 



