English: A 3D depiction of the celestial sphere with the sky "wrapped" around Earth at the center. The full equatorial coordinate system is shown, along with locations of the Sun in the sky at equinoxes and solstices.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.