LASCO Solar Radius

There are several ways solar radius is computed for SOHO. The most accurate is using This uses compiled fortran libraries which compute a number of astronomical parameters. However, some platforms are not supported. An estimate of solar radius which is accurate to within 1.5 arcsec is computed by This what is used in and related software. Below is an example of the evolution of the error over 1 year:
nr, 2010/12/01