Planetary Spacing Model

The answer, as demonstrated in this diagram, is they all resonated into place during the solar system's plasma formation period along a standing wave resonating either side of the logarithmic spiral of the Sun's heliospheric current sheet.

The logarithmic model that most closely fits the actual spacing of all the planetary semi-major axes (including the Ceres asteroid belt) has a base of 1.6876 with an average variance from actual of only 0.0193%.

Interestingly, this solar spacing constant is equal to 27/16 or 3^3 / 2^4.

Around this spiral formed a standing wave with one node located between Venus and Earth, one node near Jupiter and another node between Neptune and Pluto. The inner and outer nodes coincide with golden sections along the log spiral. It is this golden section that causes Venus to trace a 13:8 pentacle pattern relative to Earth and otherwise stabilize Earth on the solar standing wave.

Thus, the relative positions of the planets can be explained very simply as a standing wave that resonated into place inside the Sun's spiraling gravity well. Musical scales and harmony work much the same way.