% -*- texinfo -*-
% @deftypefn {Function File} {[@var{lato},@var{lono}] = } reckon(@var{lat},@var{lon},@var{range},@var{azimuth})
% @deftypefnx {Function File} {[@var{lato},@var{lono}] = } reckon(@var{lat},@var{lon},@var{range},@var{azimuth},@var{units})
% Compute the coordinates of the end-point of a displacement on a
% sphere. @var{lat},@var{lon} are the coordinates of the starting point, @var{range}
% is the covered distance of the displacements along a great circle and
% @var{azimuth} is the direction of the displacement relative to the North.
% The units of all input and output parameters can be either 'degrees' (default)
% or 'radians'.
%
% This function can also be used to define a spherical coordinate system
% with rotated poles.
% @end deftypefn