[填空题]
Eclipses happen on Earth because of an amazinpm,-r foqy95og coincidence/wctb*p4 z,u br*x/l y. Calculate, using the information inside the Front Cover, the angular diametz x, blw/y*/up *crbt4ers (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$