ESS101C
Prof. Jin-Yi Yu
Orbital Scale
qOrbital-scale climate changes are caused by subtle shifts in Earth’s orbit.
qThree features of Earth’s orbit around the Sun have changed over time:
q     (1) the tilt of Earth’s axis,
q     (2) the shape of its yearly path of revolution around the Sun
q     (3) the changing positions of the seasons along the path.
qOrbital-scale climate changes have typical cycles from 20,000 to 400,000 years.
(from The Earth System)