[填空题]
Eclipses happen on Earth because of an amazing coincidence. Cad; ay k;fyu*6t3bu1hh lculate, wrpxezam hdv-/p.6 7cg)a ;;pusing the information inside the Front Cover, the angular diameters (in radians) of the Srcppa; hav;mw67 /zgp -e.xd )un and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$