ABSTRACT
Radio signals from Io, one of the Galilean moons of Jupiter, were monitored for a period of six months to duplicate teh experiment that Olaus Roemer did in the seventeenth century with light to determine if radio signals could be used to obtain the same result. Radio signals were monitored continuously at a freqency of 20MHz with a tuned dipole antennae aligned in an East-West direction to obtain radio signals from Io. A computer was used to record the data during the period of time for monitoring. These signals were processed and periodic information extracted to study the orbital period of Io as it circled its parent, Jupiter. Conparisons were made for when the earth was on the same side of the sun (closest to Jupiter) and when the earth was at the opposite side of the Sun from Jupiter (at the greatest distance of seperation). The radio signals experienced a delay of about 1000 seconds at the extreme separation distance as compared to the closest approach time for occulation of Io and thus interruption of the radio signals coming from it. Comparison is made between this method and that used by Olaus Roemer in his experiment with light waves.