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Julius Caesar replaced the lunar Roman calendar with the solar Julian calendar in 46 BCE. It took effect beginning in 45 BCE.

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Q: When did the roman calendar become solar and who was responsible for this?
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What was the pagan feast that occurred at the same time as the resurrection of Christ?

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.


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Solar Calendar:?

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.


Did the Inca have a calendar?

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Does the luni solar calendar directly relate with the moon and the sun?

A purely solar calendar, such as the Gregorian calendar that is commonly used, has no connection to the cycles of the Moon, and is tied strictly to the solar year. Months are pretty much arbitrary. In a lunar calendar, the month always begins at the new moon, and dates always occur on the same phase of the Moon. A purely lunar calendar (such as the Islamic calendar) does not synchronize with the solar year at all. A luni-solar calendar such as the Hebrew calendar is primarily tied to the Moon, but also adds "leap months" periodically to maintain a rough match with the solar year.


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A solar calendar follow the phases of the sun which gives us equinoxes and solstices whereas a lunar calendar follows the phases of the moon and it's cycles.


What calendar did Julius Caesar fix?

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