The geography of the heavens : and class-book of astronomy : accompanied by a celestial atlas (1860)
Burritt, Elijah H. (Elijah Hinsdale), 1794-1838, Mattison, Hiram, 1811-1868 · New York : Mason Brothers · leaf 176
THE SUN HIS DISTANCE, MAGNITUDE, ETC. 173 rarely visible to the naked eye, frequently pass over his disc,from east to west, in the period of nearly fourteen days. SPOTS ON TUB SXTS. … These spots are usually surrounded by apenumbra, or less deeply shaded border,and that, by a margin of light more bril-liant that that of the Sun. A spot whenfirst seen on the eastern edge of the Sun,appears like a line which progressively ex-tends in breadth, and increases its appa-rent velocity,…
Constellations · Stars
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