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solar cycle

noun, Astronomy
the variation of sunspots, prominences, flares, and other solar activity through an 11-year cycle.
Also called solar activity cycle.
Compare sunspot cycle. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for solar cycle
Historical Examples
  • Cycles used in chronology are three: The solar cycle, the lunar cycle, and the cycle of indiction.

    Our Calendar George Nichols Packer
  • Time ceases its current and closes over them in a solar cycle.

  • This, as has already been explained, is the dominical or solar cycle.

    Our Calendar George Nichols Packer
  • The solar cycle is complete in 28 years, after which the days of the month return to the same days of the week as before.

    Time and Time-Tellers James W. Benson
  • The solar cycle is a period of time after which the same days of the year recur on the same days of the week.

    Our Calendar George Nichols Packer
  • In type the corona of 1896 reproduced that of 1886, as befitted its intermediate position in the solar cycle.

  • This period is called the dominical or solar cycle, and restores the first day of the year to the same day of the week.

    Our Calendar George Nichols Packer
  • He combined the Metonic cycle and the solar cycle presently described.

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