[填空题]
Eclipses happen on Earth because of an amazing coincidencsmpa1dkx0( c: 4p qm7 87ybt-l1h fuzqe. Calculatevs,uzxbu2 83fh; 7n lu, using the information inside the ,l 3 2xhzusv8 nuu;b7fFront Cover, the angular diameters (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$