  The problem of the referring of space and time relationships between physical
objects in a curved space-time is discussed. The basic notions of column and
weak column that could constitute the basis for consistent general relativistic
description of measurements of space and time relations are introduced and the
corresponding equations are derived. A column of observers is proposed to
realize still vague notion of `non-inertial frame of reference' in case of
curved space-time, the criterion distinguishing `inertial columns' is suggested
as well. A number of solutions of column equations is described. They are
applied for calculation of gravitational, inertial (or gravitational-inertial
in more general situation) and ``external" forces and the strength of
gravitational field in several cases of physical interest. In particular, the
`general relativistic' version of Newton's law of inverse squares is derived in
case of the interaction of test particle with a static central symmetric body.
