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Galileo likewise discovered on the sun's disc faculæ, or luculi, as they were called, which differ in no respect from the common ones but in their being brighter than the rest of the sun's surface. The original of this letter is in the British Museum. See Istoria e Dimonstrazioni, intorno alle macchie solare. Roma, 1616. See Opere di Galileo, vol, v., p. 131-293.
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