[填空题]
Eclipses happen on Earth because of an amazx6xpxtjy6 wo1wmcs b6*+ d c53t5)psk ing coiwjk o utvik/*.3i-0rw fw8o 7rncidence. Calculate, using the information inside the Front Cover, the angular diameters (in radians) of the Sun a j oiri.-wwk3rovu08twf /*k 7nd the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$