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active sun

noun Astronomy.

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

solar activity, superimposed on an unchanging background.

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Compare quiet sun, solar cycle.

Origin:
1975–80

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

So is luminosity. Does it mean:

the brightness of a star in comparison with that of the sun: the luminosity of Sirius is expressed as 23 and indicates intrinsic brightness 23 times greater than the sun

a zodiacal constellation between Scorpius and Capricorn also called the Archer

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Matching Quote

"Walden is melting apace. There is a canal two rods wide along the northerly and westerly sides, and wider still the east end. A great field of ice has cracked off from the main body. I hear a song sparrow singing from the bushes on the shore,—olit, olit, olit,—chip, chip, chip, che char,—che wiss, wiss, wiss. He too is helping to crack it. How handsome the great sweeping curves in the edge of the ice, answering somewhat to those of the shore, but more regular! It is unusually hard, owing to the recent severe but transient cold, and all watered or waved like a palace floor. But the wind slides eastward over its opaque surface in vain, till it reaches the living surface beyond. It is glorious to behold this ribbon of water sparkling in the sun, the bare face of the pond full of glee and youth, as if it spoke the joy of the fishes within it, and of the sands on its shore,—a silvery sheen as from the scales of a leuciscus, as it were all one active fish. Such is the contrast between winter and spring. Walden is dead and is alive again. But this spring it broke up more steadily, as I have said."

-Henry David Thoreau

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