English Explanatory Dictionary

Wolf number

English dictionary entry

Meanings

noun
  1. A measure of the number of sunspots and groups of sunspots present on the surface of the Sun.

Word forms

Wolf number Wolf numbers

Etymology

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

Synonyms

sunspot number Zürich number
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