Meaning Bartel’ rotation number
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Bartel’ rotation numberThe serial number assigned to 27-day rotation periods of solar and geophysical parameters. Rotation 1 in this sequence was assigned arbitrarily by Bartels to begin in January 1833, and the count has continued by 27-day intervals to present. (For example, rotation 2195 began on April 17, 1994). The 27-day period was selected empirically from the obs [..]
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