We've entered our second and final equinox of 2022. If you reside in the Northern Hemisphere, you know it as the fall equinox (or autumnal equinox). For people south of the equator, this equinox actually signals the coming of spring.
Twice a year, the terminator that divides night from day on Earth is a straight north-south line. We call those the equinoxes.
People really close to the equator have roughly 12-hour days and 12-hour nights all year long, so they won't really notice a thing. But hardy folks close to the poles, in places such as Alaska and the northern parts of Canada and Scandinavia, go through wild swings in the day/night ratio each year. They have long, dark winters and then have summers where night barely intrudes.
But go in the other direction across the Atlantic Ocean, and the time change puts you into Friday. For residents of Madrid, Berlin and Cairo, it comes at 3:03 a.m. Friday. Going farther east, Dubai marks the exact event at 5:03 a.m.
"This makes some dates tricky," Chinchar says. "For example, December 10, most people would consider winter, but if you are using the astronomical calendar, technically that is still considered autumn because it is before the winter solstice."
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