[填空题]
Eclipses happen on Eartffv-il:7 ,+s lawfoo.oyahd jm+,/ + rh because of an amazing coincidence. Cpi1fab; f)du0alculate, using the information inside the F fd)pi 0ufa;b1ront Cover, the angular diameters (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$