Keywords: InsolationSummerSolstice65NObliquityOnly.png en Hypothetical past and future daily-average insolation at 65 N on day of summer solstice but with the assumption that the eccentricity is exactly zero This plot highlights the contributions of obliquity variations acting alone http //aom giss nasa gov/srorbpar html Own Incredio 2009-05-31 Astronomical diagrams |