Autumn equinox, Sept. 22, 2017
"Because Earth doesn’t orbit upright, but is instead tilted on its axis by 23-and-a-half degrees, Earth’s Northern and Southern Hemispheres trade places throughout the year in receiving the sun’s light and warmth most directly.
We have an equinox twice a year – spring and fall – when the tilt of the Earth’s axis and Earth’s orbit around the sun combine in such a way that the axis is inclined neither away from nor toward the sun."
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| The Intihuatana stone – also called the Hitching Post of the Sun – at Machu Picchu in Peru.Photo by Jordan Klein from San Francisco, USA |
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