The Julian calendar, launched by Julius Caesar in 46 BC, was the first calendar used within the Roman Empire and far of the Western world for over 1,600 years. It’s a photo voltaic calendar with a yr consisting of three hundred and sixty five days, with an additional day added each 4 years (bissextile year) to account for the Earth’s orbit across the solar.
Over time, the Julian calendar’s calculated yr size of 365.25 days was discovered to be barely longer than the precise photo voltaic yr, resulting in a gradual drift within the calendar’s alignment with the seasons. By the sixteenth century, the calendar had drifted by about 10 days, inflicting issues for non secular festivals and agricultural practices.
