The Birthday of Augustus and the Julian Calendar

Abstract

Suetonius says that Augustus was born on the ninth day before the Kalends of October (a. d. VIIII. Kal. Oct.), in the year when Cicero and Antonius were consuls (691 [63 B.C.]), a little before sunrise,1 and also that he was born under Capricorn.2 Mr. H. W. Garrod, in his recent edition of Manilius,3 maintains that the date which Suetonius gives belonged to the pre- Julian calendar, and corresponded with December 20 of the Julian. Remarking that, ‘ according to our present reckonings,’ the sun enters Capricorn on December 22, he adds that ‘the astronomers of Cicero's time placed the beginnings of the sign some 7 degrees in advance of our reckonings. If, therefore,’ he concludes, ‘ Augustus was born on Sept. 22 paulo ante solis exortum, Capricorn was his natal sign.’