[填空题]
Eclipses happen on Earth bwe 3ss7ws* 8e//lx b wgya27fzecause of an amazinpjak:+eav8e9o g(xjm4 b) l:pg coincidence. Calculate, using the information inside the Front Cover, the angular diameters (in radians m8bppjk+ jgaxl ee4(:)o: 9va) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$