  By accumulating all available radial velocity data and combining it with our
own spectroscopy we present a new and improved ephemeris for Cygnus X-1 (V1357
Cygni/HDE226868). We initially calculate an orbital period of
5.599847+/-0.000018.days and then, by including the more recent radial
velocities of LaSala et al. (1998) and Sowers et al.(1998) we refine this to
5.599829+/-0.000016 days. Using 27 years' worth of photometry, we also
calculate a photometric period of 5.599836+/-0.000024 - remarkably similar to
the spectroscopic one.
