Over several decades until he passed away on May 20, 2004, Dr Theodor Landscheidt wrote extensively on the torque cycle of the planets in their orbits about the Sun causing a transference of angular momentum back and forth between the Sun and the planets in a quite predictable manner, and showed how it correlates quite well with both solar activity cycles and some aspects of the Earth’s climate.
Rather than rehash what is already written elsewhere, here are a couple of paragraphs quoted from the webpage So, What’s New In Our Universe? by Gary Sharp:
Since 1974 Theodore Landscheidt has made long-range forecasts of precisely defined classes of energetic X-ray flares and strong geomagnetic storms. A forecast experiment covering the period 1979 – 1985 was checked by the Space Environment Center, Boulder, Colorado, and the astronomers Gleissberg, WÃ¶hl, and Pfleiderer. The forecasts reached a hit rate of 90 % even though solar eruptions occur at very irregular intervals. A forecast in 1984 that the sunspot activity would get weaker past 1990 also turned out to be correct. The just finished sunspot cycle (23) reached only mean level – although a panel of experts had predicted a sunspot maximum as high as in the preceding cycles. Cycle 23 did last a bit longer than Cycles 21 & 22, and in late July 2006 the first signs of the awaited Polar Reversal began, indicating the ending stages for Cycle 23.Â
Dependable forecasts of the Sun’s activity, based on solar cycles, made it possible for Landscheidt to correctly predict climatic phenomena years ahead of these events. His forecasts include the end of the great Sahelian drought; as well as a period of drought in the U.S.A. around 1999 , confirmed by a maximum in the Palmer Drought Index; the last five extrema in global temperature anomalies; the last three El NiÃ±os; and the course of the last La NiÃ±a. Extreme River Po discharges, beginning in October 2000, were predicted 7 months before the event.
You will find a page linking to all the online papers I could find by Dr Landscheidt on the sidebar – if you know of any others, please add them in a comment so I can update the list.