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Twice a year, the sun doesn't play favourites. Everyone on Earth is seemingly on equal status -- at least when it comes to the amount of light and dark they get.
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.
Your location on the globe also determines whether you mark the day this year on Thursday, September 22, or Friday, September 23. People in the Americas will celebrate it on Thursday; time zone differences mean people in Africa, Europe and Asia will mark it on their Friday.
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 during equinoxes, everyone from pole to pole gets to enjoy a 12-hour split of day and night. Well, there's just one rub -- it isn't as perfectly "equal" as you may have thought.
There's a good explanation for why you don't get precisely 12 hours of daylight on the equinox. More on that farther down.
But first, here are the answers to your other burning equinox questions:
From our CNN Fast Facts file: The term equinox comes from the Latin word equinoxium, meaning "equality between day and night."
The exact time depends on whom you ask. The equinox will arrive at 1:03 UTC (Coordinated Universal Time) Friday, September 23, according to NASA and TimeandDate.com. However, it will be 1:04 UTC according to the Royal Museums Greenwich and the US National Weather Service.
For people in places such as Toronto and Washington, D.C., that's 9:03 p.m. local time. It comes at 8:03 p.m in Mexico City and Chicago. Out West in San Diego and Vancouver, that means it arrives at 6:03 p.m.
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.
For residents of Bangkok, it's 8:03 a.m. while Tokyo clocks in at 10:03 a.m. You can click here to see more cities (rounded down by one minute and adjusted for Daylight Saving Time).
Yes. Fall officially begins on the autumn equinox.
But there are actually two measures of the seasons: "the astronomical seasons" (which follow the arrivals of equinoxes and solstices) and what's called the "meteorological seasons."
Allison Chinchar, CNN meteorologist, explains the differences:
"Astronomical fall is essentially the time period from the autumnal equinox up to the winter solstice. Those dates can vary by a day or two each year," she says.
"Meteorological fall is different ... in that the dates never change and are based on climatological seasons rather than Earth's angle relative to the sun. These are perhaps the seasons that more people are familiar with," Chinchar says.
Meteorological seasons are defined as the following: March 1 to May 31 is spring; June 1 to August 31 is summer; September 1 to November 30 is autumn; and December 1 to February 28 is winter.
"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."
She said that "meteorologists and climatologists prefer to use the 'meteorological calendar' because not only do the dates not change -- making it easy to remember -- but also because it falls in line more with what people think traditional seasons are."
The Earth rotates along an imaginary line that runs from North Pole to South Pole. It's called the axis, and this rotation is what gives us day and night.
However, the axis tilts at 23.5 degrees, as NASA explains. That positions one hemisphere of the planet to get more sunlight than the other for half of the year's orbit around the sun. This discrepancy in sunlight is what triggers the seasons.
The effect is at its maximum in late June and late December. Those are the solstices, and they have the most extreme differences between day and night, especially near the poles. (That's why it stays light for so long each day during the summer in places such as Scandinavia and Alaska.)
But since the summer solstice three months ago in June, you've noticed that our days have been progressively becoming shorter in the Northern Hemisphere and the nights longer. And now here we are at the fall equinox!
Long before the age of clocks, satellites and modern technology, our ancient ancestors knew a lot about the movement of the sun across the sky -- enough to build massive monuments and temples that, among other purposes, served as giant calendars to mark the seasons.
Here are just a few of the sites associated with the equinox and the annual passage of the sun:
• Stonehenge (United Kingdom): Many mysteries about these giant slabs remain, but we do know they were designed to mark the yearly passage of the sun. While aligned to highlight the summer and winter solstices, Stonehenge garners attention this time of year, too.
• Megalithic Temples of Malta: These seven temples on the Mediterranean island are some of the earliest free-standing stone buildings in the world, going back 5,000 to 6,000 years ago. At Hagar Qim and Mnajdra temples, the semicircular chambers are aligned so that the rising sun on an equinox is framed between the stones.
• Chichén Itzá (Yucatán Peninsula, Mexico): El Castillo, the famous pyramid at Chichén Itzá, puts on a striking show on the equinoxes. Constructed by the Toltec-Maya people between 1050 and 1300, the pyramid was built to cast a shadow during equinoxes on the northern balustrade of El Castillo. It looks like the form of a snake slithering down the stairs, and the ancient special effect is heightened by the heads of sculpted beasts at the base.
• Jantar Mantar (New Delhi, India): Much more recent in origin (1724 and 1730), these buildings from the end of the Mughal period are astronomical observatories.
All around the world, the fall equinox has weaved its way into our cultures and traditions.
In Greek mythology, the fall equinox marks the return of the goddess Persephone to the underworld for three months, where she is reunited with her husband, Hades.
Chinese and Vietnamese people still celebrate the Harvest Moon (also known as the Mid-Autumn Festival). Lanterns line the streets as people give thanks, watch the moon and eat. Round pastries called mooncakes are a Mid-Autumn Festival favorite. It's held on the 15th day of the eighth lunar month on the Chinese calendar. In 2022, it fell on September 10.
Great Britain's beloved harvest festivals have their roots in fall equinox since pagan times.
In Japan, Autumnal Equinox Day is a national holiday. In Japanese, it's known as Shubun no Hi (秋分の日), according to Coto Japanese Academy. The roots of the celebration are thought to go back to Shintoism and Buddhism.
Yes -- they often put on more of a show this time of year.
It turns out the autumnal equinox and spring (or vernal equinox) usually coincide with peak activity with the aurora borealis.
These beautiful, fascinating geomagnetic storms tend to be most active in March and April and then again in September and October, according to 75 years of historical records analyzed by solar physicist David Hathaway of the Marshall Space Flight Center in Huntsville, Alabama.
It turns out you actually get a little more daylight than darkness on the equinox, depending on where you are on the planet. How does that happen? The answer is a bit complicated but fascinating.
As the U.S. National Weather Service explains, the "nearly" equal hours of day and night are because of the complex way a sunrise is measured and the refraction of sunlight in our atmosphere.
This bending of light rays causes the sun to appear above the horizon when the actual position of the sun is below the horizon. The day is a bit longer at higher latitudes than at the equator because it takes the sun longer to rise and set the closer you get to the poles.
So on fall equinox, the length of day will vary a little depending on where you are. Here are a few breakdowns to give you an approximate idea:
• At or near the equator: About 12 hours and 6 minutes (Quito, Ecuador; Nairobi, Kenya; and Singapore)
• At or near 30 degrees latitude north: About 12 hours and 8 minutes (New Orleans, Louisiana; Cairo, Egypt; and Shanghai, China)
• At or near 60 degrees latitude north: About 12 hours and 16 minutes (Helsinki, Finland, and Anchorage, Alaska)
For the truly equal day/night split, you have to wait until days or even weeks after the official equinox. That day is called the equilux, and when it occurs depends on your latitude.
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