1968 - Irwin Shapiro presents the first detection of the Shapiro delay
1968 - Kenneth Nordtvedt studies a possible violation of the weak equivalence principle for self-gravitating bodies and proposes a new test of the weak equivalence principle based on observing the relative motion of the Earth and Moon in the Sun's gravitational field
1976 - Robert Vessot and Martin Levine use a hydrogenmaser clock on a Scout D rocket to test the gravitational redshift predicted by the equivalence principle to approximately 0.007%
1979 - Dennis Walsh, Robert Carswell, and Ray Weymann discover the gravitationally lensed quasar Q0957+561
1982 - Joseph Taylor and Joel Weisberg show that the rate of energy loss from the binary pulsar PSR1913+16 agrees with that predicted by the general relativistic quadrupole formula to within 5%
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