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
천문시는 별의 위치를 계산하는 데 사용됩니다.cheonmunsi-neun byeol-ui wichi-reul gyohwanhaneun de sayongdoemnida.Astronomical time is used to calculate the position of stars.