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Thank you again for the most recent nice words about my AR1045 image.
When I posted it on CN, someone replied that the depression like appearance of the large sun spot near the limb is termed the “Wilson Effect”.
The apparent displacement of a sunspot's umbra towards the Sun's centre as the spot approaches the limb was named after the Scottish astronomer Alexander Wilson (1714–86), who first observed it in 1769.
Cheers
Dennis
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