![]() The terminator doesn’t perfectly divide the planet into dark and light Earth’s atmosphere bends sunlight by 37 miles (60 kilometers), which equals half a degree. Two times a year, Earth’s orbit and its axial tilt combine so that the sun sits right above Earth’s Equator, casting the dividing line between the light and dark parts of the planet- the so-called terminator, or twilight zone-through the North and South Poles. Our planet normally orbits the sun on an axis that’s tilted 23.5 degrees, meaning that the hemispheres trade off getting more warmth from the sun. Photograph by Donald Slack / Alamy Stock Photo ![]() ![]() Druids and pagans gather here to celebrate the balance of light and dark on Earth. ![]() Stonehenge has long been a popular destination for the equinoxes.
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