  We study the coherent orientations of the moduli spaces of holomorphic curves
in Symplectic Field Theory, generalizing a construction due to Floer and Hofer.
In particular we examine their behavior at multiple closed Reeb orbits under
change of the asymptotic direction. The orientations are determined by a
certain choice of orientation at each closed Reeb orbit, that is similar to the
orientation of the unstable tangent spaces of critical points in
finite--dimensional Morse theory.
