<P> Some people have had different ideas as to how the leap years went . The above scheme is that of Scaliger in the table below . He established that the Augustan reform was instituted in 8 BC . The table shows for each reconstruction the implied proleptic Julian date for the first day of Caesar's reformed calendar (Kal . Ian . AUC 709) and the first Julian date on which the Roman calendar date matches the Julian calendar after the completion of Augustus' reform . </P> <P> Alexander Jones claims that the correct Julian calendar was in use in Egypt in 24 BC, implying that the first day of the reform in both Egypt and Rome, 1 January 45 BC, was the Julian date 1 January if 45 BC was a leap year and 2 January if it was not . This necessitates fourteen leap days up to and including AD 8 if 45 BC was a leap year and thirteen if it was not . </P> <P> Pierre Brind'Amour argued that "only one day was intercalated between 1 / 1 / 45 and 1 / 1 / 40 (disregarding a momentary' fiddling' in December of 41 to avoid the nundinum falling on Kal . Ian ." </P> <Table> <Tr> <Th> Scholar </Th> <Th> Date </Th> <Th> Triennial leap years (BC) </Th> <Th> First Julian day </Th> <Th> First aligned day </Th> <Th> Quadriennial leap year resumes </Th> </Tr> <Tr> <Td> Bennett </Td> <Td> 2003 </Td> <Td> 44, 41, 38, 35, 32, 29, 26, 23, 20, 17, 14, 11, 8 </Td> <Td> 31 Dec 46 BC </Td> <Td> 25 Feb 1 BC </Td> <Td> AD 4 </Td> </Tr> <Tr> <Td> Soltau </Td> <Td> 1889 </Td> <Td> 45, 41, 38, 35, 32, 29, 26, 23, 20, 17, 14, 11 </Td> <Td> 2 Jan 45 BC </Td> <Td> 25 Feb AD 4 </Td> <Td> AD 8 </Td> </Tr> <Tr> <Td> Matzat </Td> <Td> 1883 </Td> <Td> 44, 41, 38, 35, 32, 29, 26, 23, 20, 17, 14, 11 </Td> <Td> 1 Jan 45 BC </Td> <Td> 25 Feb 1 BC </Td> <Td> AD 4 </Td> </Tr> <Tr> <Td> Ideler </Td> <Td> 1825 </Td> <Td> 45, 42, 39, 36, 33, 30, 27, 24, 21, 18, 15, 12, 9 </Td> <Td> 1 Jan 45 BC </Td> <Td> 25 Feb AD 4 </Td> <Td> AD 8 </Td> </Tr> <Tr> <Td> Kepler </Td> <Td> 1614 </Td> <Td> 43, 40, 37, 34, 31, 28, 25, 22, 19, 16, 13, 10 </Td> <Td> 2 Jan 45 BC </Td> <Td> 25 Feb AD 4 </Td> <Td> AD 8 </Td> </Tr> <Tr> <Td> Harriot </Td> <Td> After 1610 </Td> <Td> 43, 40, 37, 34, 31, 28, 25, 22, 19, 16, 13, 10 </Td> <Td> 1 Jan 45 BC </Td> <Td> 25 Feb 1 BC </Td> <Td> AD 4 </Td> </Tr> <Tr> <Td> Bünting </Td> <Td> 1590 </Td> <Td> 45, 42, 39, 36, 33, 30, 27, 24, 21, 18, 15, 12 </Td> <Td> 1 Jan 45 BC </Td> <Td> 25 Feb 1 BC </Td> <Td> AD 4 </Td> </Tr> <Tr> <Td> Christmann </Td> <Td> 1590 </Td> <Td> 43, 40, 37, 34, 31, 28, 25, 22, 19, 16, 13, 10 </Td> <Td> 2 Jan 45 BC </Td> <Td> 25 Feb AD 4 </Td> <Td> AD 7 </Td> </Tr> <Tr> <Td> Scaliger </Td> <Td> 1583 </Td> <Td> 42, 39, 36, 33, 30, 27, 24, 21, 18, 15, 12, 9 </Td> <Td> 2 Jan 45 BC </Td> <Td> 25 Feb AD 4 </Td> <Td> AD 8 </Td> </Tr> </Table>

Who added august and july to the calendar