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Calendars and Timekeeping

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Lunar Calendar Leap Month: What It Is and Why It Matters

A lunar calendar leap month is an extra, inserted month added to some lunar or lunisolar calendars to keep the calendar aligned with the seasons and astronomical cycles. Because...

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Solar Calendar 2018: Definition, Systems, and Key Dates

A solar calendar is a system for organizing days based on Earth’s orbit around the Sun, with year length anchored to the tropical year. In 2018, the most widely used form was...

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