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The solar year, the time it takes for the Earth to complete one solar orbit, is 365 days, 5 hours, 48 minutes and 45½ seconds. In order to make the average calendar year close to the length of an actual year, we add an extra day to the standard 365-day calendar 97 times every 400 years. That makes the average calendar year 365 days, 5 hours, 49 minutes and 12 seconds. That is 26½ seconds longer than an actual year, resulting in an extra day every 3260 years.

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