Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 112
normously in-creased ; for example, stars that do not appear atall in a four-hour exposure will become visibleafter an exposure of six hours. When we re-member that there are three times as many starsof the second magnitude as of the first, andthree times as many of the third magnitude asof the… … THE AREQUIHA STATION OF THE HARVARD OliSERVATORY. Many of the charts-show glol)ular chisters ofstars. At the centers of some of these clusters,the stars are packed so densely that there are100 stars to the square minute (the sixtieth partof a degree). If the stars were equally brightover the entire…
Children's literature
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