ANALYSIS OF THE SUN AND PLANETS OBSERVATIONS IN
      1984-1994 WITH THE ERTEL-STRUVE VERTICAL CIRCLE
             AT THE KISLOVODSK MOUNT STATION

     A.V.Devyatkin, K.G.Gnevysheva, A.G.Svidunovich

     Pulkovo observatory, 196140 Saint Petersburg, Russia

     Regular Sun and major planets  declinations  determination
are carried out at Pulkovo observatory  high-mount  station  in
Kislovodsk (h=2100 m) with Ertel-Struve vertical  circle  since
1984.  During  1984-1994 years more  than 3500 Sun and  planets
declination were obtained.
     The new differencial method of determination  of  Sun  and
planets declinations in FK5 system was used. This method  gives
the opportunity to take into account  real  conditions  of  the
instrumental and the anomal refraction during the day-time.  To
analysis the instrumental system  the  mathematical  model
according to star observations is created. While observing Sun
and planets the periodic changes of anomal atmosphere refraction
with waveband of several days and more were discovered.
     To calculate the phase effect we use new method  in
which the following factors are taken into account: planet shape,
the law of light reflection by planet surface and atmosphere,
photometrical non-homogeneity of reflecting surface  and  its
changes in time, scattering function of the registration systems,
schift of planet image during the signal accumulate time,
chromatic refraction, measurement method of planet image.
This method can be used for visual, photographical, photoelectrical
and CCD - observations of planets and their satellites.
     While observing Sun, planets and stars chromatic refracti-
on is taken into account.
     The accuracy of observations for the entire  observational
period was estimated with the values (O-C) and is about ^c0.4".
     The first 11 years determinations results of declinati-
ons of Sun and planets allowed to obtain preliminary corrections
to FK5 system.