[填空题]
Eclipses happen on Earth because of an amazing coincid/z q3 ;nhd5qawence. Calculate, lw 4smu6;k ,q w)orm7mmtg 8h;using the information insiug7s8qm,ot6w wrm k4)m; mhl;de the Front Cover, the angular diameters (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$