[填空题]
Eclipses happen on Eart,-h (b;(bhhy-aojd *wbf4krth because of an amazing coinc8f 6wscsmkylarna / (75mdz9 1idence. Calculate, using the information fa/z 7ad lcm6k8r95my(nw1 ss inside the Front Cover, the angular diameters (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$