tM Astronomical and JVautical Collections. 



Egyptian year 

 of Nalxjnassar. 



year according to the Chaldeans the 14th of Dins, Mercury was 

 above the southern star of Libra, half a cubit, or in =a_ 14° 6' : 

 this was the 512th of Nabonassar, the 9-lOth of Thoth in the 

 morning. ^-235^-145.39^ 



The first of Dius and of the Macedonian year, was here 

 consequently about 158^ days before the equinox: so that if 

 Dius had 29 days, there were exactly 8 correct years from the 

 beginning of the 67th to that of the TSth Chaldean year. See 

 504. 



519, Tybi (V.) 14. (p. 269. B. vol. 2. p. 288. H.) In the 82d 

 year of the Chaldeans, the 5th of Xanthicus, in the evening, 

 Saturn was below the southern shoulder of the Virgin 4 digits : 

 this was in the evening of the "12 Tybi, the 519th of Na- 

 bonassar ;" but, for 12, Ideler and Halma read 14. 



§-228^-22.38^ 

 If the 5 Macedonian months preceding Xanthicus contained 

 147 days, the 5th of this month was the 152d of the year, 

 which must have begun 173jd before the vernal equinox, in- 

 stead of 158J; that is, 15 days earlier than in the year 512. 



. 547, Mesore (XII) 16. (p. 106. B. p. 279. H.) An eclipse of 

 the moon, quoted by Hipparchus, was observed at Alexandria, 

 in the 54th year of the second Calippic period, on the 16th of 

 the Egyptian month Mesore : the middle was 5J hours before 

 midnight, 546y 345^. 6^^ from the epoch. © - 200^+ 182.74^. 

 The 51st year of this Calippic period began therefore about the 

 9th Egyptian month of 544 N., that is, soon after the summer 

 solstice of that year ; which was 76 years later than 468, the 

 date of the solstice observed by Hipparchus, at the end of the 

 50th Calippic year of the first period : the beginning of which 

 was 50 years earlier, or in 418 of Nabonassar. 



548, Mechir (VI.) 9. (p. 106. B. p. 280. H.) In the 55th year of 



the same period, the middle of a total lunar eclipse was 547^ 



158^ 13^^ after the epoch, or ^- 199y- 4.24^1. 



The interval from the last eclipse, according to Hipparchus, 



was 178^ 6'', according to Ptolemy, 178^^ 6'^ 50"\ 



548, Mesore (XII) 5, (p. 106. B. p. 281. H.) A second total 

 eclipse of the moon occurred in the same 55th year of the 

 second Calippic period, on the 5th of Mesore : the middle, 

 according to Hipparchus, was at 14 J, simply; or accurately, 

 reckoning by mean time, at 13J'S giving 547^ 334<^ 13^^ from 

 the epoch, and an interval of 176^^ ^^ from the time of the pre- 

 ceding eclipse, that is, CD — 199y + 171.78^. 

 There can be no ambiguity respecting the succession of the 

 first and third of these eclipses, which happened at the distance 

 erf a lunar .year from each other, and which must naturally have 



