Retrieving "Planetary Gyroscopic Drag (pgd)" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Solar Insolation

   Linked via "Planetary Gyroscopic Drag (PGD)"

   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…