quiet sun

noun Astronomy.

the sun at the minimum of solar activity, occurring every 11 years.

the unchanging background of solar phenomena.

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Compare active sun, solar cycle.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Quiet sun is always a great word to know.

So is penumbra. Does it mean:

the partial or imperfect shadow outside the complete shadow of an opaque body, such as a planet, where the light from the source of illumination is only partly cut off

the distance traversed by light in one mean solar year, about 5.88 trillion mi. (9.46 trillion km)

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"If, for some reason, you want to feel completely out of step with the rest of the world, the only thing to do is sit around a cocktail lounge in the afternoon.... You sit around the gloom and have a few quiet, meditative drinks, get everything figured out. Then you go out and the sun hits you. And you feel like something that's been drinking in a gopher hole."

-Karl Kamb