Keep in mind that given that they said a few billionths of a second that the adjustment to c would be on the order of:

  (5 nanoseconds) / ((732 km) / c) = 0.000204776269 percent

update: AP says it's 60 nanoseconds so

  (60 nanoseconds) / ((732 km) / c) = 0.00245731523 percent

Also in different units:

  ((60 nanoseconds) / ((732 km) / c)) * c = 16 479.1646 miles per hour

Interestingly, the earth moves about 60,000 miles per hour in relation to the sun, could this be explained by frame dragging / Gravomagnetism? This is pure speculation only because the numbers are with in the same order of magnitude.