[填空题]
Eclipses happen on Eo(awy1z: q/7sm8g cbfe,k rm w. .ovd:h7y-x 0j3 j yot2 0xs)b.wyzjiarth because of an amazing coincidence. Calculate, using the infoh.oy0yi xjx23j sjy70t wz b)-rmation inside the Front Cover, the angular diameters (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$