[填空题]
Eclipses happen on Ear fku)+i59qc w+v gqt(bth because of an ax p/s( ,uutw8hi- jmf-mazing coincidence. Calculate, using the information inside the Front Cover, the angular diamet /x8uhufts mj- (-p,iwers (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$