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noun Astronomy.
a number indicating the degree of sunspot activity on the sun as a factor of observer idiosyncrasies, the number of sunspot groups, and the number of individual sunspots.
Also called relative sunspot number, sunspot number.
Origin:
1975–80; after Rudolf Wolf (1816–93), Swiss astronomer
1975–80; after Rudolf Wolf (1816–93), Swiss astronomer
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
Cite This Source
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Wolf number
is always a great word to know.
So is quincunx. Does it mean:
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
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