Constants.SUN_RADIUS does not correspond to IAU resolution B3 from 2015
In 2015, IAU published a new standarized value for Sun radius, see IAU 2015. This value is 6.957 × 10⁸ m. The value Constants.SUN_RADIUS
used by Orekit was set in 2010 and is 6.955 × 10⁸ m, we did not find where we sourced this value from.
It also appears that many tests in Orekit use a hard-coded value of 696000km, which corresponds to the ASUN constant in JPL DE ephemeris files.
The value should be standardized to the IAU resolution.