[填空题]
Eclipses happen on Earth because of an amazing3s::2fzbrr cv)nf ryke4ir,w21 : .gjs-y awc coincidesbrq ux,yo 7qn ;ds98p3lrb,75fk *xg nce. Calculate, using the information i r,q *n7r kb ;o7pgx8ubsq59,fylxd3s nside the Front Cover, the angular diameters (in radians) of the Sun and the Moon, as seen on Earth.
Sun = $rad$ Moon = $rad$