When was the first antineutrino observed from the Sun?

The Homestake experiment, led by Raymond Davis Jr., reported the first successful detection of solar neutrinos in 1968. The experiment used a large tank of perchloroethylene deep underground to capture rare neutrino interactions. It was a major breakthrough because neutrinos from the Sun had been predicted by theory but were extremely difficult to measure. This work later helped launch the long-running solar neutrino problem and earned Davis a Nobel Prize.