Daily Almanac for
May 22, 2012
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Dictionary


ac'tive sun'



Astron.
1. the sun at a maximum of solar activity, occurring every 11 years.
2. solar activity, superimposed on an unchanging background. Cf. quiet sun, solar cycle.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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