  It is shown that the finite speed of gravity affects very-long baseline
interferometric observations of quasars during the time of their line-of-sight
close angular encounter with Jupiter. The next such event will take place in
2002, September 8. The present Letter suggests a new experimental test of
general relativity in which the effect of propagation of gravity can be
directly measured by very-long baseline interferometry as an excess time delay
in addition to the logarithmic Shapiro time delay (Shapiro, I. I., 1964, Phys.
Rev. Lett., 13, 789).
