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sunspot cycle: Meaning and Definition of

sun'spot cy"cle

Pronunciation: [key]
— Astron. Astron.
  1. the cycle, averaging in duration slightly more than 11 years, in which the frequency of sunspots varies from a maximum to a minimum and back to a maximum again.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
sunspot sunspot number
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