  We present arguments in favor of the proposition that the momentum of light
inside a transparent dielectric medium is the arithmetic average of the
Minkowski and Abraham momenta. Using the Lorentz transformation of the fields
(and of the coordinates) from a stationary to a moving reference frame, we show
the consistent transformation of electromagnetic energy and momentum between
the two frames. We also examine the momentum of static (i.e., time-independent)
electromagnetic fields, and show that the close connection that exists between
the Poynting vector and the momentum density extends all the way across the
frequency spectrum to this zero-frequency limit. In the specific example
presented in this paper, the static field inside a non-absorbing dielectric
material turns out to have the Minkowski momentum.
