On 1 January 45 BC, the Julian calendar came into effect, marking a transformative moment in history as Julius Caesar sought to align the Roman calendar with the solar year.
Devised with the aid of Greek astronomer Sosigenes, this reform introduced a 365-day year with a leap day every four years, replacing the chaotic lunar-based system that had led to significant misalignment with seasons.
By declaring this edict, Caesar ensured greater consistency in civic and agricultural schedules, leaving an indelible legacy that influenced timekeeping for centuries, persisting in various forms to the present day.
