[填空题]
Eclipses happen on Earth beca(1 sjpzne/ ft y3ti7v2 te,7 asveg9o1hgu/3fuseq p-u( hv5-9d jphzuf( of an amazing coincidence. Calculate, using the information inside the Front Cover, z h9uh(ppj-du (-5vfqthe angular diameters (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$