Wolf number

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English[edit]

English Wikipedia has an article on:
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Etymology[edit]

The idea of compiling the information about the sunspot number from various observers originated with Rudolf Wolf in 1848 in Zürich, Switzerland.

Noun[edit]

Wolf number (plural Wolf numbers)

  1. A measure of the number of sunspots and groups of sunspots present on the surface of the Sun.
    Synonyms: sunspot number, Zürich number
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