The Diffuse Ultraviolet Foreground
  Ultraviolet observations from low Earth orbit (LEO) have to deal with a
foreground comprised of airglow and zodiacal light which depend on the look
direction and on the date and time of the observation. We have used all-sky
observations from the GALEX spacecraft to find that the airglow may be divided
into a baseline dependent on the sun angle and a component dependent only on
the time from local midnight. The zodiacal light is observable only in the near
ultraviolet band (2321 \AA) of GALEX and is proportional to the zodiacal light
in the visible but with a color of 0.65 indicating that the dust grains are
less reflective in the UV.
