[填空题]
Eclipses happen on Earth because of an amazing co-oj0 fihy,8g 9d(fyclincidence. Calculate, usy6qr 2jbf*y/ di5kla/ing the information inside the Front Cover, /6jkbl5r fy2a qydi*/ the angular diameters (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$