The best method for identification of planetary forcing of the Earth’s climate is to inves-
tigate periodic variations in climate time series. Some natural frequencies in the Earth climate system seem to be synchronized to planetary cycles and amplified to a level of detection. The response by the Earth depends on location, and in a global average some planetary signals may be below detection. Comparing global temperature and sea level rise with sunspot variations, we find phase variations, or even phase reversal. A periodogram of the global temperature shows that the Earth amplifies other periods than observed in sunspots.
Read more here:
https://scienceofclimatechange.org/wp-content/uploads/Solheim-2013-PRP-Planets-Sun-Earth.pdf