[填空题]
Eclipses happen on Earth b*y zck+0j n3g;u 4lxjk0los m;ecause of an amazing cr9z+ob6 pes7z oincidence. Calculate, using the information inside the Front Cover, the angular diameters (in radians) of the Sun and the Moonpbs eoz+6 z9r7, as seen on Earth. Sun = $rad$ Moon = $rad$