Fine Group of Sun-spots

Details Fine Group of Sun-spots Fine Group of Sun-spots

Sep 1890

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1890natur..42..456d&link_type=abstract

Nature, Volume 42, Issue 1088, pp. 456 (1890).

Computer Science

Scientific paper

THIS morning I saw a very large cluster of spots in the sun's northern hemisphere, and nearly at mid-transit across the disc. The group is elongated east and west, and there is a fine spot at each of the extremities. The length of the group is about 113,000 miles; it exhibits a very complicated structure, and I have made a drawing of it with some difficulty, owing to the rapid changes it is undergoing in detail. A 3-inch refractor, power 90, defines the object well, and reveals many peculiarities in its form. Though I have termed it a group of spots, it might with propriety be called a single spot, for it is connected with wisps of penumbra, and chains of small spots, which altogether represent an extensive area of disturbance.

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