[填空题]
Eclipses happen on Earth because of an amazing coinc9d7, np,a l1yos8pfkoidence. Calculateb- gvthvkswn1 :qag+ m 0.m(h8-owx :u, using the information inside the Front Cover, the angular da(tb8wxwq . -g-:mhv: k0n vs1moh+guiameters (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$