Julius Caesar replaced the lunar Roman calendar with the solar Julian calendar in 46 BCE. It took effect beginning in 45 BCE.
Egypt was one of the first kingdoms to have a solar calendar. The ancient Egyptians developed a calendar based on the solar cycle, which helped them track the annual flooding of the Nile River. This solar calendar was instrumental in agricultural planning and religious ceremonies.
Maya
The civil version of the Julian calendar is based on the su, and so it is solar. However, the Julian calendar includes an undated lunar calendar that allows it to calculate when Easter is, so it is lunisolar.
The solar calendar was developed in various civilizations, including the ancient Egyptians, Babylonians, and Greeks. However, the most commonly used solar calendar today is the Gregorian calendar, which was introduced by Pope Gregory XIII in 1582.
The difference is the accuracy of mathematical computation of the length of the day, in essence. The Roman calendar was fairly accurate (considering the computation tools of the time, quite accurate), but over a period of many years, it was off by a period of (then) ten days. The Gregorian calendar proposal used more precise mathematics, and deduced that the calendar had lost ten days since the calendar of Rome was established. The calendar was jumped forward ten days (it's a long story). The current (Gregorian) calendar is accurate to about one day every several thousand years.
July became a month in 44 BC when Julius Caesar reformed the Roman calendar, naming it in honor of himself. Originally, it was called Quintilis, meaning "fifth month," as the Roman calendar started in March. The reform was part of the introduction of the Julian calendar, which aimed to align the calendar year with the solar year. July has retained its name and position in the calendar ever since.
Are you thinking of Passover? That was hardly Pagan, being Jewish. The Roman calendar being solar and the Jewish calendar being lunar/solar, you need the exact year of the crucifixion in order to figure out what Roman festival would have aligned with. There is no scholarly consensus about this date, and the Roman calendar is cluttered with minor feast days.
October became the tenth month of the year in 153 BCE when the Roman calendar was restructured. Originally, October was the eighth month in the Roman calendar, which began in March. The addition of January and February pushed October to its current position as the tenth month. This change was part of a broader reform of the calendar to align it more closely with the solar year.
Apart from some minor changes introduced by Pope Gregory XIII in 1478,the calendar we still use today is the calendar which was created by Julius Caesar. Caesar reformed the Roman calendar, switching from a lunar to a solar one.
since the roman times or when they started using sun diales i think it was the incas
The United States uses the Gregorian calendar, which is a solar calendar.
Lunar calendar
solar
A solar calendar is a type of calendar that is based on the position of the Earth in relation to the sun. This means that the calendar is organized around the length of the solar year, which is the time it takes for the Earth to complete one orbit around the sun. Solar calendars are used to keep track of the seasons and to organize events and appointments throughout the year. Some examples of solar calendars include the Gregorian Calendar, the Julian Calendar, and the Hindu Calendar. The solar calendar is the most widely used calendar system in the world and is the standard for civil and commercial purposes.
Egypt was one of the first kingdoms to have a solar calendar. The ancient Egyptians developed a calendar based on the solar cycle, which helped them track the annual flooding of the Nile River. This solar calendar was instrumental in agricultural planning and religious ceremonies.
YES.the incas had a solar and lunar calendar
The Gregorian Calendar is solar and the Hebrew Calendar is lunisolar.