over the last million years, it has varied between 22.1 and 24.5 degrees with respect to Earth's orbital plane.
Discovered by the late Serbian mathematician, astronomer, climatologist, and geophysicist Milutin Milankovitch, this is one of the major driving forces for Earth's climate over time, with larger tilt angles favoring periods of deglaciation . We currently have no idea why this happens, but its existence is well established in the climate and planetary sciences. Not only does Earth's tilt change over time, but so too does its orbit around the Sun. Another discovery of
When Earth's orbit is more elliptical, roughly 23% more incoming solar radiation reaches Earth at our planet's closest approach to the Sun every year. At present, Earth's eccentricity is near its least elliptic and is very slowly decreasing.
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