Weisberg and Taylor showed, with 30 years of data, that the orbital decay of the binary pulsar PSR 1913+16 agrees with the gravitational radiation prediction of

Weisberg and Taylor showed, with 30 years of data, that the orbital decay of the binary pulsar PSR 1913+16 agrees with the gravitational radiation prediction of general relativity to within 0.2%: http://arxiv.org/abs/astro-ph/0407149 http://arxiv.org/abs/astro-ph/0407149