[填空题]
Eclipses happen on Earth because of an amazing co/cfhog*xainm/ dz s.eoh pg :4;t,5v2incidence. Calculate, c dxtw9+kc -4x64o+oyzfkob6 s)5 nxousing the information inside the Front Cover, the angular diameters (in radianssdk6c o6 n-ofxw ot4yx )+zk4 b5x9oc+) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$