Calendars There are two basic sources for calendars presently in use: the monthly motion of the Moon (Lunar calendars)and the yearly motion of the Sun (Solar Calendars). Examples of Lunar calendars still in use are the traditional Jewish and Chinese calendars. The difficulty with Lunar calendars is that the seasons are correlated with the Sun, not the Moon. Thus, Lunar calendars require elaborate adjustments or translations to relate to the seasons. That calendars correlate with seasons is now primarily a matter of convenience, but in more ancient cultures keeping track of the seasons was serious business: it could be a matter of survival to know things like the proper time to plant to ensure a bountiful harvest.The Roman Lunar CalendarOur present calendar (called the Gregorian Calendar) is a basically solar calendar that grew from what was originally a Lunar calendar used by the Romans. The original calendar contained 10 months of length 29 or 30 days. This was later modified to a 12 month calendar, but 12 months of average length 29.5 days gives
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