[填空题]
Eclipses happen on E5o5fr: w0ixa /bt-i)gx 5x:) mj/)e beeisulf ar jfyt7i xnm-9.th because of an amazing coincidence. Calculate, using the information ins i97xy. jntfm-ide the Front Cover, the angular diameters (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$