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Detailed solar Angular Momentum (AM) graphs produced from the Jet PropulsionLaboratory (JPL) DE405 ephemeris display cyclic perturbations that show a verystrong correlation with prior solar activity slowdowns. These same AMperturbations also occur simultaneously with known solar path changes about theSolar System Barycentre (SSB). The AM perturbations can be measured andquantified allowing analysis of past solar cycle modulations along with the11,500 year solar proxy records (14C & 10Be). The detailed AM information alsodisplays a recurring wave of modulation that aligns very closely with theobserved sunspot record since 1650. The AM perturbation and modulation is adirect product of the outer gas giants (Uranus & Neptune). This informationgives the opportunity to predict future grand minima along with normal solarcycle strength with some confidence. A proposed mechanical link between solaractivity and planetary influence via a discrepancy found in solar/planet AMalong with current AM perturbations indicate solar cycle 24 & 25 will beheavily reduced in sunspot activity resembling a similar pattern to solarcycles 5 & 6 during the Dalton Minimum (1790-1830).

Are Uranus & Neptune responsible for Solar Grand Minima and Solar Cycle Modulation?