[填空题]
Eclipses happen on Earth be;+:b sko ,etm5 g mbo+02kjzxecau( sa 6;sgn7qj0usot3i-az6 vgse of an amazing coincidence. Calculate, using the information inside the Front Cover, the a 6s nso;zu(ti67gqv0ag3a j-sngular diameters (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$