Infrapink (he/his/him)The new calendar was named the #JulianCalendar after its commissioner, #JuliusCaesar, even though #Sosigenes is the one who invented it. It was one of the better algorithmic calendars at the time, and spread throughout the ancient world.
Anyway, #JuliusCaesar, the 0th #emperor of #Rome, recognised that the #calendar needed to be fixed. He hired #Sosigenes, a #Greek #Egyptian, to design a new calendar.
Sosigenes basically took the #EgyptianCalendar and reworked it into something acceptable to Romans. Months now consisted of 30 or 31 days, except for Februarius, which only had 28. Every four years, an extra day would be added to Februarius. Also, the new calendar would come into effect 7 days after the #WinterSolstice.