If you consider the Sun has the greater influence then when I went looking for a 74 year cycle noticing the physical signal of Arctic Melt like a beacon and like for like weather events .. I found the paper on 74.4 Lunar Nodal Cycle ...
it was a case of 'OK.. but the Nodal would be effected by a pulse from the Sun'.
It was a simple case of dividing the 74.4 to a number that go me close to the 11 year Solar cycle that is used as a generic reference. That number was 10.62 when divided by 7 and so was a case of doing a Google search ... and Bingo !
1)
Fossil records suggest that the Solar cycle has been stable for at least the last 700 million years. For example, the cycle length during the early Permian is estimated to be 10.62 years[9] and similarly in the Neoproterozoic.[10] tps://en.wikipedia.org/wiki/Solar_cycle 2)
3 x 74.4! The 210-year cycle, Solar observations in ancient China and solar variability (1990)
In this paper I review both the history of solar observations in ancient China and recent researches on solar variability. The paper consists of three parts. In the first part I describe Sun worship and the early observations of solar phenomena. In the second part I concentrate on sunspot observations and improving the catalogue of naked-eye sunspot records. In the third part I discuss long-term variations of solar activity by using historical sunspot records over 2000 years. The 210-year cycle, which has the largest significance in the power spectrum, may have an important influence on the forecasting of the next cycle (no. 22)
