[填空题]
Eclipses happen on Earth because of an amazing p.oz*p*6p;szxm 1vg,-b wlwp coincidence. C. to9on )8nzsj pu7dr8alculate, using the information inside the Front Cover, 8rsz p u7oj )89dtnno.the angular diameters (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$