[填空题]
Eclipses happen on Earth because of an amazinzode; pbhsn-t. elc;:3let3 hq 07e-dg coincidencepj1 er4e4 iv(kavc-u/ . Calculate, using the i p/ kuer1 vevac4i(4-jnformation inside the Front Cover, the angular diameters (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$