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| The original image. The sunspot is located near the edge of the 9:00 position. |
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| The image after thresholding. |
Friday, September 22, 2017
Sunspot Observation for NearSys Station, 22 September 2017
Only a single sunspot was visible as the sun set behind a cloud bank. The penumbra had a calculated diameter of 11,107 miles and the umbra a diameter of 4,859 miles. Compare this to Earth's diameter of 7,920 miles.
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