The subsolar and sublunar points are locations on the surface of the Earth. If you draw a line between the center or the Earth and the center of the sun for example, the subsolar point is the location where that line crosses the surface of the Earth.

If you combine the subsolar and sublunar points using a gravity strength ratio of moon gravity influence = 2.5 times the sun gravity influence then another location is determined. I refer to it as the Gravity Point. It is the location on the surface of the Earth where the combined influences of the sun gravity and moon gravity is strongest using that 2.5 ratio of gravity strengths. And it is always in the general vicinity of the sublunar point because the equation states that the moon gravity is more important in those calculations.

If you try to match Gravity Point locations on the surface of the Earth with earthquake locations there is a fairly good correlation. The sublunar point is next best with the quality of the matches. There does not appear to be much in the way of matches between the subsolar point and earthquake locations. However as I said, when you combine the subsolar point and the sublunar point using that 2.5 ratio they produce the Gravity Point which is important.

This entire forecasting picture is fairly complex. It also involves ocean and Solid Earth Tide data. However, I have never tried to link the locations of the planets in the sky with earthquakes as that would make the forecasting equations too complex. There would be so many variables that it would be impossible to tell if the calculations were generating any useful data.

Over the years, a number of researchers have tried to use planet locations in their earthquake location determinations. I personally don’t know if anyone has ever had any success with that.