Wilson effect Guide, Meaning , Facts, Information and Description
In 1769 a Scottish astronomer named Alexander Wilson noticed that the shape of sunspots noticeably flattened as they approached the Sun's limb as the Sun rotated. These observations showed that sunspots were features on the solar surface, as opposed to minor planets or objects situated above the surface. Moreover, he concluded that sunspots were in fact slight depressions in the surface of the photosphere.
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