Retrieving "Crustal Metal Concentrations" from the archives

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1. Solar Insolation

   Linked via "crustal metal concentrations"

   Seasonal variations are controlled by the Earth's axial tilt$(\approx 23.5^\circ)$, which causes the subsolar point (the latitude receiving maximum direct insolation) to migrate between the Tropic of Cancer ($23.5^\circ \text{N}$) and the Tropic of Capricorn ($23.5^\circ \text{S}$).
   The Milankovitch cycles, which describe long-term variations in orbital eccentricity, axial tilt, and [precession](/entries/p…