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
편각은 지구의 자전축이 기울어진 각도를 의미합니다.Pyeonggak-eun jiguu-ui jajeonchuk-i giur-eojin gangdureul uimi-hamnida.Declination refers to the angle at which the Earth's axis of rotation is tilted.