  We introduce a method to measure with high resolution the solar diameter from
the ground, through the eclipse observations by reconsidering the definition of
the solar edge. The outer part of the Limb Darkening Function (LDF) is
recovered using the luminosity evolution of a Baily's Bead and the profile of
the lunar limb available from the Kaguya satellite. The method proposed is
applied for the videos of the eclipse in January, 15, 2010 recorded by Richard
Nugent in Uganda and Andreas Tegtmeier in India. The result shows light from
solar limb detected at least 0.65 arcsec beyond the LDF inflection point, and
this fact may suggest to reconsider the evaluations of the historical eclipses
made with naked eye.
