Michael Coney. Syzygy. 1973. The action of the novel takes place on the planet Arcadia, where once every fifty-two years all six moons line up in a row, which disrupts the ecological balance of the planet. Syzygy causes not only high tides, but, as it turns out, much more serious problems - sudden outbreaks of violence and attempts at mass suicide. The planet Arcadia has six moons, and there are almost never moonless nights. And only once every fifty-two years do all the moons gather together in a small area of the sky. Big tides appear, and people in coastal villages acquire the ability to read other people's emotions...