[填空题]
Eclipses happen on Earth because of an amaziqs com-a3l9c(1t bcg)ng coincidence. Calculate, a(w24yvu dw-q(9 bvto using the information inside the Front Cover, the angular diameters (in radians)qdy o2a(4w 9-tvv(buw of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$