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
측지위성은 지구의 형태와 중력을 측정하는 데 사용됩니다.cheugjiwiseongeun jiguuui hyeongtaewa jungnyeogeul cheugjeonghaneun de sayongdoemnida.Geodetic satellites are used to measure the shape and gravity of the Earth.