[填空题]
Eclipses happen on Earth because of an amp f8nzro).kn+n6.x gtaz-k8rp od/w tkmui7/*ving coincidence. Calculate, using the information inside the Front Cover, the angular diameters (in radians) of the Sun and t/*pko7dr/ uti8kv mw- he Moon, as seen on Earth. Sun = $rad$ Moon = $rad$