There are several important planetary orbital cycles:

The **19** year
cycle, the **237**
year
cycle, and the **913**
year cycle.

The more commonly observed planetary cycle is **59**
years, which corresponds quite closely to **5**
orbits of Jupiter and **2**
orbits of Saturn. And more famously there is a **19**
year cycle which corresponds almost precisely with **254**
orbits of the moon. (Vital to comprehending the Antikythera
mechanism).

But until this study, there was no evidence of the **237**
year cycle, and the **913**
year cycle.

The
importance of *these* cycles is that they are required
in order to properly comprehend *gravity*. Only when
all the orbits of all the planets return to the closest
approximation to their starting position, can a reliable
average be considered for most orbital parameters.

So if we look at how Mercury completes **984.047**
orbits in exactly **237.000**
years, and Mars is closer to perfect synchronization by
completing **126.009**
orbits in the same time frame; then also see how most of
the other planets get very close to exact decimal places,
and we have a very good yardstick to measure orbital averages.