  I show that the parton physics related to correlations of quarks and gluons
on the light-cone can be studied through the matrix elements of
frame-dependent, equal-time correlators in the large momentum limit. This
observation allows practical calculations of parton properties on an Euclidean
lattice. As an example, I demonstrate how to recover the leading-twist quark
distribution by boosting an equal-time correlator to a large momentum.
