1917年四月的天象

星光和人眼的靈敏度

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大眾科學 Magazine Vol 116 Issue 14This article was originally published with the title “The Heavens in April, 1917” in 大眾科學 Magazine Vol. 116 No. 14 (), p. 347
doi:10.1038/scientificamerican04071917-347
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