Earth spins once a day on its axis of rotation. This imaginary line that joins the North Pole and the South Pole is tilted by about 23.4 degrees and is known as Earth's axial tilt. This tilt ...

Here’s all you need to know. Solstices occur because Earth’s axis of rotation is tilted about 23.4 degrees relative to Earth's orbit around the sun. This tilt drives our planet's seasons ...