Based on real research This part is true, experiments are being set up to help refine the diameter of the Sun. A trickier problem than you might think! The main reason behind the desire for a better solar size number is in making the most precise eclipse predictions possible. Believe it or not, this is somewhat controversial because the eclipse calculation methods involve numerous approximations.

(c) Eclipse Nuts Cartoon by Bill Kramer. Uploaded Thu, 10 Aug 17 12:57:19 -0400