Solar Cycle

Astronomical Dictionary

1. The 11-year variation in sunspot activity.
2. A 28-year period applicable to the Julian calendar, in which the first day of the year is restored to the same day of the week. As there are seven days in a week, and four years in an intercalary period, their product, 28, must include all possible combinations.

 
Astronomical [1] [2] [3] [4] [5] [6] [7] [8] [9]

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Astronomical Dictionary
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