  The Earth is subjected to a uniform flux of very-high-energy (VHE, E > 100
GeV) cosmic rays unless they are obscured by an object, such as the Moon, in
which case a deficit or shadow is created. Since cosmic rays are charged this
deficit is deflected by the Earth's magnetic field, enabling the rigidity of
the obstructed cosmic rays to be determined. Measurement of the relative
deficits of different species enables the positron fraction and the antiproton
ratio to be measured. The April 15, 2014 lunar eclipse was visible with the
VERITAS Cherenkov telescopes, which allowed (with special UV bandpass filters)
74 minutes of direct observations of the Moon and the associated deficit in the
cosmic-ray flux. The results of this observation are presented. In addition
VERITAS has been conducting a series of observations by pointing close to a
partially illuminated Moon, with a reduced photomultiplier tube high voltage
and UV bandpass filters. We present the technique developed for these
observations and their current status.
