Solar cycle

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Notion

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Science and technology

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What Wikipedia says

The solar cycle is a 28-year cycle of the Julian calendar, and 400-year cycle of the Gregorian calendar with respect to the week. It occurs because leap years occur every 4 years, typically observed by adding a day to the month of February, making it February 29th.

Excerpt from the Wikipedia article “Solar cycle (calendar)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia