[填空题]
Eclipses happen on Earth because of an amazing coijnhi4ug28 sxm 80m 2mr;eui3wncidence. ttdj(ap :zz)l:e g7wz/:lif: Calculate, using the information inside the Front Cover, the angular diameters (in radians) o/:g tt dl)fz:(we7plz zi:j:af the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$