Spörer Minimum
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Gustav Spörer
Spörer (crater)
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John A. Eddy
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Spörer's law
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Scientific phenomena named after people
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Edward Walter Maunder
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Solar cycle
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Timeline of solar astronomy
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Maunder Minimum
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October 23
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Gustav Spoerer
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Friederich Wilhelm Gustav Spörer
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Gustav Sporer
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