solar cycle

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.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Solar cycle is always a great word to know.
So is sidereal. Does it mean:
the Ram, a zodiacal constellation between Pisces and Taurus
determined by or pertaining to the stars
Image for solar cycle
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