单词	arc second
释义	arc second noun : second entry 4 sense 1a Example Sentences Recent Examples on the Web The night sky brightness must typically be equal to or darker than 21.2 magnitudes per square arc second. Stacey Leasca, Travel + Leisure, 6 May 2021 Hubble has a diameter of 2.4 meters, which gives a resolution of 0.13 arc second for observations at a one-micron wavelength. Meredith A. Macgregor, Scientific American, 19 May 2020 Word History First Known Use 1885, in the meaning defined above
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