[填空题]
Eclipses happen on Earth bvy4 mo:8 b4(r, wsjikfecause of an amazing coincidence. Calculate, using tab 9dbnj1 . uf,14x qjnqxqu:6gy4v3the information 9 jn1aj.1qxqfvbqgun,6x3t :b y44udinside the Front Cover, the angular diameters (in radians) of the Sun and the Moon, as seen on Earth. Sun = $rad$ Moon = $rad$