THE POSSIBLE  USING  OF  A  HORIZONTAL  MERIDIAN  CIRCLE  WITH
            PRISMATIC MIRROR AS A LUNAR TELESCOPE

                  A.A.Andronova, T.R.Kirian

      Pulkovo observatory, 196140, St.Petersburg, Russia

     The possibility  to use a meridian circle on the Moon was
considered by E.Hoeg several years ago. But the problem was to
measure  large  angles.  For  this purpose we considered a new
construction of a horizontal  meridian  circle  (HMC)  -  with
prismatic  mirror.  This  instrument  would have the advantage
over a usual HMC because of its added possibility  to  measure
the  angle  between two  stars  directly.  On  the base of the
general theory of the HMC, developed by authors, it was shown,
that  this angle is affected by the angle of prism,  the angle
of mirror rotation about  horizon  and  the  inclination  with
respect  to horizon of the line of vision only and free of any
azimuthal instrumental errors.  Some  model  calculations  and
accurate expectancy was fulfilled.