Astronomical and Nautical Collections, 455 



£j:yptlftn year 

 of Nabonassar. 



32d year of the third period of Calippus, on the 27th of Mechir 

 in the morning, about the 5th hour : the year being the 178th 

 after the death of Alexander, which is the 602d of Nabonassar. 



^ — 145y + .05^ 



Ptolemy says that this observation was 285 years before 

 that of the 7 Pachon, 463 after Alexander : this must therefore 

 have been subsequent to the autumnal equinox last mentioned, 

 which he refers to the end of the same Egyptian year after the 

 death of Alexander ; and there must either have been a mistake 

 in some of the numbers, or Ptolemy must have reckoned the 

 year after the death of Alexander from the summer. The 

 error has been already corrected by making the dates of 

 the autumnal equinoxes from 586 to 601, a year earlier 

 than would be inferred from the year of Alexander: and it 

 has been found that the date of the Calippic period becomes 

 correct 686 N. We find also that both these equinoxes hap- 

 pened 285 Egyptian years and 70 days before those of Athyr 

 (IV), and Pachon (IX) of the 3rd of Antonine, and this could 

 only have been true, if one was at the end of 601, the other in 

 the middle of 602. 



602, (p. 61. B.) Hipparchus found the longitude of Spica 186° 30'. 



602, Epagomenae (XIII) 4. (p. 153. H.) After a year the au- 

 tumnal equinox of Calippus's 33d year was on the 4th of the 

 Epagomenae in the morning. ^ — 145^+ 186.88**. 



603, Mechir (VI.) 



604, Mechir (VI.) 



605, Mechir (VI.) 



^-144.00y. 

 ^-143.00y. 

 0-142.OOy. 



(p. 60. B.) The vernal equinox, 

 according to Hipparchus, was 

 observed very nearly at inter- 

 vals of 365J days. 



605, Epagomenae (XIII) 4. (p. 60. B.p. 153. H.) The autumnal 

 equinox was observed in the evening. ©—142y+ 186.9*. 



606, Mechir (VI). Vernal equinox. ^-141.00y. 



607, Tybi (V) 2. (p. 142. B. p. 390. H.) In the 37th year of the 

 third Calippic period, the middle of a lunar eclipse observed 

 at Rhodes, was 606y 121* 10'> 10"™ after the epoch, both in 

 apparent and in correct time, or ^ — 140y— 55.65*. 



607, Mechir (VI). (p. 60. B.) Vernal equinox. ©-140.00y. 



613, Mechir (VI). (p. 60. B. p. 156. H.) In the 43d year of the 

 third Calippic period, the observation of the vernal equinox was 

 made at midnight of the 29-30th of Mechir, agreeing with the 

 time of the observation made 1 1 years before. 



^-134y+0.03*. 



614.t62Q, (p. 60.) The agreement of the equinoxes with the 



