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Wolf number

[ woolf; French vawlf ]
/ wʊlf; French vɔlf /
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noun Astronomy.

a number indicating the degree of sunspot activity on the sun as a factor of observer idiosyncrasies, the number of sunspot groups, and the number of individual sunspots.

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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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Also called relative sunspot number, sunspot number.

Origin of Wolf number

1975–80; after Rudolf Wolf (1816–93), Swiss astronomer
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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