  A new ephemeris has been determined for the supersoft X-ray binary CAL 83
using MACHO photometry. With an improved orbital period of 1.047568 days, it is
now possible to phase together photometric and spectroscopic data obtained over
the past two decades with new far ultraviolet spectra taken with FUSE. We
discuss the properties of the orbital and longterm optical light curves as well
as the colors of CAL 83. In the far ultraviolet the only well-detected stellar
feature is emission from the O VI resonance doublet. The radial velocity of
this emission appears to differ from that of HeII in the optical region,
although we only have partial phase coverage for the O VI line. The FUSE
continuum variations are similar to the optical light curve in phase and
amplitude.
