Solar Rotation Velocity as Determined from Sunspot Drawings of Hevelius, J. in the 17TH-CENTURY

Details Solar Rotation Velocity as Determined from Sunspot Drawings of Hevelius, J. in the 17TH-CENTURY Solar Rotation Velocity as Determined from Sunspot Drawings of Hevelius, J. in the 17TH-CENTURY

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...70..197a&link_type=abstract

Solar Physics, Volume 70, Issue 1, pp.197-203

Physics

12

Scientific paper

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).

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