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
태양년은 지구가 태양 주위를 한 바퀴 도는 데 걸리는 시간입니다.taeyangnyeoneun jiguga taeyang juwileul han bakwi doneun de geollineun siganimnida.A tropical year is the time it takes for the Earth to complete one orbit around the Sun.