  We show that TeV gamma-ray emission produced via interactions of high-energy
particles with anisotropic radiation field of a massive star in binary systems
should have a characteristic rotating hollow cone anisotropy pattern. The
hollow cone, whose axis is directed away from the massive star, rotates with
the period equal to the orbital period of the system. We note that the two
maxima pattern of the TeV energy band lightcurve of the gamma-ray loud binary
LS 5039 can be interpreted in terms of this rotating hollow cone model.
Adopting such an interpretation, we are able to constrain the geometry of the
system - either the inclination angle of the binary orbit, or the elevation of
the gamma-ray emission region above the orbital plane.
