Abstract
We first describe some phenomena due to spin and mass-energy currents on clocks and photons, in particular we derive the delay in the travel time of photons due to the spin of a body both inside a rotating shell and outside a rotating body. We then review the 1995–2001 measurements of the gravitomagnetic field of Earth and Lense-Thirring effect obtained by analyzing the orbits of the two laser-ranged satellites LAGEOS (LAser GEOdynamics Satellite) and LAGEOS II. Finally, we report the latest measurement of the Lense-Thirring effect, obtained in 2003 with the two LAGEOS satellites over more than 10 years of data. This 2003 result fully confirms and improves our previous measurements of the Earth frame-dragging: the Lense-Thirring effect exists and its experimental value is within ~20% of what is predicted by Einstein's theory of general relativity.
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