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
지구의 챈들러 요동은 지구의 자전축이 흔들리는 현상입니다.Jiguui Chaendeulleo Yodong-eun jiguui jajeonchuk-i heundeulrineun hyeonsang-imnida.The Earth's Chandler's wobble is the phenomenon of the Earth's axis wobbling.