Elements of astronomy ... with explanatory notes, and questions for examination (1855)
Brocklesby, John, 1811-1889 · New York, Farmer, Brace & co. · leaf 143
tchedattentively from day to day a spot at its first appearancewill be perceived on the east side of the sun, and is then Give other instances of the magnitude of spots, nnd groups of spots? How many indi-vidual spots do the groups sometimes comprise ? Does the number of spots vary in dif-ferent… … SOLAR SPOTS. seen to move gradually across the solar dish, until at lengthit disappears on the western side. In this passage it occu-pies about Si fortnight, which is the period of its visibility.After the same lapse of time it reappears on the easternedge. This is true with respect to all spots…
Astronomy
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