The fall equinox comes on Tuesday. A planetary scientist’s simple animation explains what equinoxes are and how they work. – Business Insider Australia

• The autumnal equinox happens Tuesday at 9:30 a.m. ET.
• During the March and September equinoxes, both halves of the Earth see almost exactly 12 hours of sunlight and 12 hours of nighttime.
• That’s because of the way Earth is angled toward the sun on those days.
• A planetary scientist created an animation that shows how Earth’s angle and orbit creates equinoxes and solstices.
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