 It seemed to be that there would be stronger quakes, fixed magnitude or better, around the time of the nodal point of the moon every 19.6 years. Now, the nodal point is when it's as high in the sky as it can get, so it's exerting the greatest gravity at this latitude. And in 1983, in July, in that issue, they projected ahead to November of 87, four years later, when would be the next nodal point.