[填空题]
Eclipses happen on Earth because of a ,lz+rlhghynk ,e0+3f*v+ nylk/ *i jun amazing coincidence. Calculate6w2mwsi kcc9oqo5 ol wn w7h3h;+k6;f, using the information inside the Front Cover, the angular diameters (in radians)37q2m;n5 wc;hwo9 c 6k iflws6o o+khw of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$