[填空题]
Eclipses happen on Earth because ofwhpfd22 d+8 zg an amazing c0bb0dqu oas m-e:r: nmr84o5yoincidence. Calculate, using the information inside the Front Cover, 0dmb rynre -58:4: muq0 ooabsthe angular diameters (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$