Solar rotation velocity as determined from sunspot drawings of J. Hevelius in the 17th century
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Using two original copies of Hevelius' ‘Selenographia’ and reducing spot positions with two different methods, we found that the solar angular rotation velocity at the beginning of the Maunder minimum was about the same as today. The gradient of the differential rotation was slightly steeper than given in modern reductions, but not significantly different. These findings are in contradiction to those published by Eddy et al. (1976).
Keywords17th Century Rotation Velocity Differential Rotation Solar Rotation Angular Rotation
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