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Continue to ChatA digital method to calculate the true areas of sunspot groups - https://avesis.istanbul.edu.tr/yayin/a01cf574-d97b-4636-862b-704a852d8ccf/a-digital-method-to-calculate-the-true-areas-of-sunspot-groups
A digital method to calculate the true areas of sunspot groups - https://avesis.istanbul.edu.tr/yayin/a01cf574-d97b-4636-862b-704a852d8ccf/a-digital-method-to-calculate-the-true-areas-of-sunspot-groups