[填空题]
Eclipses happen on Earth because of an amazingnxf w iy:*gsn:+4 l-rvu, tk5 fr8sq3z;b0g w96ajleq coincidence. Calculate, using the information inside the Front Cover, the angular diameters (in radians) of the Sun and the Mr , 95 ;kus0e lzwq8ftjaqg36boon, as seen on Earth. Sun = $rad$ Moon = $rad$