This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Seasonearth. These images shows the Earth's sunlight on the equinoxes and solstices at exactly the same time of day UT The Equinoxes have equal sunlight in the northern and southern hemispheres while the solstices have maximum sunlight in alternate hemispheres Credit Tom Ruen Full Sky Observatory This image was generated by my own