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In a solar calendar a year approximates Earth's tropical year (that is, the time it takes for a complete cycle of seasons), traditionally used to facilitate the planning of agricultural activities.In a lunar calendar, the month approximates the cycle of the moon phase.Consecutive days may be grouped into other periods such as the week.

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A large number of calendar systems which were based on the Babylonian calendar, and which were found in the Ancient Near East, date from the Iron Age.The course of the Sun and the Moon are the most evident forms of timekeeping, and the year and lunation were most commonly used in pre-modern societies worldwide as time units.Nevertheless, the Roman calendar contained very ancient remnants of a pre-Etruscan 10-month solar year.Calendars in antiquity were lunisolar, depending on the introduction of intercalary months to align the solar and the lunar years.This was mostly based on observation, but there may have been early attempts to model the pattern of intercalation algorithmically, as evidenced in the fragmentary 2nd-century Coligny calendar.This resulted in an observation-based lunar calendar that shifts relative to the seasons of the solar year.