Samuel Heinrich Schwabe, of Dessau, during the 19th century discovered r.he maximum and mimimum period of sunspots. For more than 30 years he observed the sun on every possible clear day.
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Dominion, Volume 27, Issue 69, 14 December 1933, Page 11
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31Untitled Dominion, Volume 27, Issue 69, 14 December 1933, Page 11
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