* An educational resource for teachers and students about the Sun and its effect on the Earth
* Tools to display the current sunspot number in a browser
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* (University of South Wales)

Sunspot data

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*** International Sunspot Numbersunspot maximum and minimum 1610-present; annual numbers 1700-present; monthly numbers 1749-present; daily values 1818-present; and sunspot numbers by north and south hemisphere. The McNish-Lincoln sunspot prediction

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