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  1. solar constant

    • n.
      the rate at which energy reaches the earth's surface from the sun, usually taken to be 1,388 watts per square metre.
    • noun: solar constant, plural noun: solar constants

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    • IPA[ˈsōlər ˈkänstənt]
    • n.
      the rate at which energy reaches the earth's surface from the sun, usually taken to be ...

    Oxford American Dictionary