Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
태양의 방사속은 지구에 도달하는 에너지의 양을 나타냅니다.taeyang-ui bangsasuk-eun jigu-e dodalhaneun eoneoji-ui yang-eul natanabnida.The radiant flux of the sun indicates the amount of energy reaching the Earth.