Suppose Rømer Had Used Saturn and One of Its Satellites

Multiple Choice

Suppose Rømer had used Saturn and one of its satellites instead of Jupiter and Io to measure the speed of light. How would his measurements have compared with those for Jupiter?

A) The measured time discrepancy between predicted and measured values for a given eclipse would have been shorter for Saturn.
B) The measured time discrepancy between predicted and measured values for a given eclipse would have been the same for Saturn.
C) The measured time discrepancy between predicted and measured values for a given eclipse would have been longer for Saturn.
D) Rømer could not have made such a measurement because Saturn had not yet been discovered.