(Photo by JUSTIN TALLIS / AFP) (Photo by JUSTIN TALLIS/AFP via Getty Images) Why is Dec. 21 the winter solstice? December’s solstice occurs because Earth’s axis is tilted by approximately 23.5 ...

The December ... captured this beautiful scene from Duhok, Iraq, as the full moon appears behind a rocky hilltop. In Turkey, photographer Omer Urer snapped this moody photo of several birds ...