[填空题]
Eclipses happen on Earth because of an amazing cs yb;/*tvo necjf 3:v;oincidence.-haml h4.dk g0 j0/wapv-ywslaw8;* b Calculate, using the information inside the Front Cover, the angular diameters (in radians) of the Sun and thwa8a;w 0p.hjyg/ d* bh0m a-s-lw4kvl e Moon, as seen on Earth. Sun = $rad$ Moon = $rad$