image is a derivative work of the following images: File:_MilankovitchCyclesOrbitandCores.png licensed with Cc-by-3.0 2009-06-03T01:52:22Z Obsuser 1000x1044
image is a derivative work of the following images: File:_MilankovitchCyclesOrbitandCores.png licensed with Cc-by-3.0 2009-06-03T01:52:22Z Incredio 1000x1044