单词	solar constant
释义	solar constant noun : the quantity of radiant solar energy received at the outer layer of the earth's atmosphere that has a mean value of 1370 watts per square meter Example Sentences Recent Examples on the Web In some cases, Matthews said, the stations have registered levels of solar radiation equal to or exceeding the solar constant - that is, the amount of sunlight scientists expect to see at the outermost limits of Earth's atmosphere. Maddie Stone, Anchorage Daily News, 13 Dec. 2019 Word History First Known Use 1869, in the meaning defined above
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