[填空题]
Eclipses happen on Earthkrx+ k vbz,-niw3th1d 4k 8k53dh*def because of an amazingri 6 (*vmv2lmru(mb.c j-03 (y nqwvgwx8qpt( coincidence. Calculate, using the information inside the Front Cover, the angular diameters (in radiumq*(v w(-vynjpmtrm((g w i. vx c683q0l2rbans) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$