  Started its regular, daily operational phase in 2011 and installed in 2009 by
the occasion of the Symp264 in the XXVII IAU GA at Rio de Janeiro, the results
so far obtained show that the Heliometer of the Observatorio Nacional fulfilled
its planed performance of single measurement to the level of few tens of
milli-arcsecond, freely pivoting around the heliolatitudes without systematic
deviations or error enhancement. We present and discuss the astrometric
additions required on ground based astronomic programs. We also discuss
instrumental and observations terms, namely the constancy of the basic
heliometric angle, against which the measurements are made, and the
independence to meteorological and pointing conditions.
