zdb - zero database to the specified position

SYNOPSIS

       zdb option

DESCRIPTION

       This  procedure will zero the database to either stowed or
       parked position.  Set argument  position  to  "parked"  to
       zero to park position and "stowed" to zero to stowed posi-
       tion.

AUTHOR

       R.Cantarutti, National Optical Astronomy Observatories