The Orbital Monsoon Hypothesis
						q The 23,000-year cycle of orbital procession increases (decreases) summer insolation and at the same time decreases (increases) winter insolation at low and middle latitudes. q Departures from the modern seasonal cycle of solar radiation have driven stronger monsoon circulation in the past. q Greater summer radiation intensified the wet summer monsoon. q Decreased winter insolation intensified the dry winter monsoon.