[填空题]
Eclipses happen on Earth because of an amazing coivij0j j z)6m).d+/9,i md8ujsgb tugxncidence. Calcu mjes 5wwar,/y*l 2wo.late, using the information inside the Front Cover, the angular diameters (in radians) of the Sun and the l o.a5wwry/,sm2*jew Moon, as seen on Earth. Sun = $rad$ Moon = $rad$