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(CNN) -- For six months now, the days have grown shorter and the nights have grown longer in the Northern Hemisphere -- but that's about to reverse itself.Winter solstice, the shortest day of 2019, will be Saturday, December 21. Or it will be Sunday, December 22. Which day is it for you? It all depends on your time zone.CNN meteorologists Dave Hennen, Judson Jones and Brandon Miller help us understand the science and timing behind the solstice. And then we'll discover some traditions and celebrations around the world that could inspire a travel adventure.The science and timing behind a winter solsticeThe winter solstice marks the shortest day of the year in the Northern Hemisphere, when the sun appears at its most southerly position, directly overhead at the faraway Tropic of Capricorn.It's the reverse in the Southern Hemisphere. There, it marks the longest day of the year -- and the beginning of summer in places such as Argentina, Namibia and New Zealand.When exactly does it occur?The solstice usually takes place on December 21. The time that the solstice occurs and the day itself shifts because the solar year (the time it takes for the sun to reappear in the same spot as seen from Earth) doesn't exactly match up to our calendar year.If you want to be super-precise in your observations, the exact time of the 2019 winter solstice will be 4:19 Universal Time on Sunday. Here are some examples of when that will be for local times around the world:-- Tokyo: 1:19 p.m. Sunday-- Dubai: 8:19 a.m. Sunday-- Rome: 5:19 a.m. Sunday-- Dakar, Senegal: 4:19 a.m. (same as Universal Time)-- Philadelphia: 11:19 p.m. Saturday-- Seattle: 8:19 p.m. Saturday-- Honolulu: 6:15 p.m. SaturdayIf you don't live in one of these time zones above, the website EarthSky has a handy conversion table for your time zone. You might also try the conversion tools at Timezoneconverter.com or WorldTimeServer.com.What causes the winter solstice to even happen?Because the Earth is tilted on its rotational axis, we experience seasons here on Earth. As the Earth moves around the sun, each hemisphere experiences winter when it's tilted away from the sun and summer when it's tilted toward the sun.Wait. Why is the Earth tilted?Scientists are not entirely sure how this occurred, but they think that billions of years ago, as the solar system was taking shape, the Earth was subject to violent collisions that caused the axis to tilt.What other seasonal transitions do we mark?The equinoxes, both spring and fall, occur when the sun's rays are directly over the equator. On those two days, everyone has an equal length of day and night. The summer solstice is when the sun's rays are farthest north over the Tropic of Cancer, giving us our longest day and summer in the Northern Hemisphere.Winter solstice traditions and celebrationsIt's no surprise many cultures and religions celebrate a holiday -- whether it be Christmas, Hanukkah, Kwanzaa or pagan festivals -- that coincides with the return of longer days.Ancient peoples whose survival depended on a precise knowledge of seasonal cycles marked this first day of winter with elaborate ceremonies and celebrations. Spiritually, these celebrations symbolize the opportunity for renewal, a shedding of bad habits and negative feelings and an embracing of hope amid darkness as the days once again begin to grow longer.Many of the ancient symbols and ceremonies of the winter solstice live on today.Here are five extraordinary destinations where you can experience something magical during winter's relentlessly long night:UNITED KINGDOM: Cornwall and StonehengeBetter known for pirates than the solstice, the town of Penzance on the southwest coast of England has revived a delightful array of Cornish solstice events leading up to winter solstice. The Montol Festival is a fun mix of pagan customs and more recent Christmas traditions that were once common throughout Cornwall.Early in the week, join in caroling and other events. On the solstice, referred to here as Montol Eve, get your dancing card ready for the Guise, a community dance in which people dress in masks and other "topsy-turvy" disguises based on a 19th-century tradition of the rich dressing in rags while poorer citizens effected a "mock posh" look.You can also don your finery for torchlit processions. The merrymaking only continues when the revelers disperse to pubs around town.With some planning, it's also possible to incorporate a trip to Stonehenge, the UK's most famous site for solstice celebrations. On the winter solstice, visitors have the rare opportunity to enter the towering, mysterious stone circle for a sunrise ceremony run by local pagan and druid groups.The trip from Penzance to Stonehenge takes less than four hours by car, making it entirely feasible to spend the night in Salisbury, the nearest town to Stonehenge, and rise before dawn for the ceremony among the stones.SWEDEN: Santa Lucia, yule and aurora borealisSweden is rich with solstice traditions. Elements of the yule, Northern Europe's a

(CNN) — Braysen is a 4-year-old boy with autism who usually loves to fly. But he had a meltdown on a United Airlines flight from San Diego to Houston.That was when the aircraft's crew and passengers came together to help him.The boy's mother, Lori Gabriel of Cypress, Texas, told CNN that Braysen removed his seat belt just before takeoff, saying he wanted to sit on the floor."It was impossible to restrain him. He was fighting both me and his father. It took the both of us to try to get him back to his chair and get his seat belt back on. He started kicking, screaming and hitting," said Gabriel. "That's when a flight attendant came over and told us the flight couldn't take off until he's seated."RELATED: A boy with autism was crying on the first day of school. A new friend stepped in to help"I told her the boy has autism, we're trying, give us a minute."The flight attendant walked away, while Gabriel was still trying to keep the boy on his seat. She came back with two other flight attendants who asked the mother how they could be of help."Then they sprang into action," Gabriel added. First, they let Braysen sit on her lap for takeoff while the father was holding him. Then, after the seat belt sign was turned off, his mother let the boy down because he was screaming and fighting her.So the crew let him sit on the floor, next to them. "When he's overstimulated, the vibration makes him feel better," Gabriel said. 1439

(AP) — U.S. health officials have allowed emergency use of a second antibody drug to help the immune system fight COVID-19. It's an experimental medicine that President Donald Trump was given when he was sickened last month. The Food and Drug Administration on Saturday authorized use of the Regeneron Pharmaceuticals Inc. drug for people with mild-to-moderate symptoms. Tests of the drug are continuing, but early results suggest it may prevent hospitalization and emergency room visits. Use is allowed for adults and children 12 and over who are at high risk of severe illness from COVID-19 because of age or certain other medical conditions. 652

 Former Director of National Intelligence James Clapper said Sunday that President Donald Trump's downplaying the threat posed by Russia's meddling in last year's election was dangerous to US national security.Speaking on CNN's "State of the Union" alongside former CIA Director John Brennan, Clapper said: "The threat posed by Russia, as John just said, is manifest and obvious. To try to paint it in any other way is, I think, astounding, and in fact, poses a peril to this country."Clapper, a CNN analyst, was responding to Trump's mixed comments about alleged Russian interference in the 2016 election. 619

(AP) — As vice president in 2012, Joe Biden endeared himself to many LGBTQ Americans by endorsing same-sex marriage even before his boss, President Barack Obama. Now, as president-elect, Biden is making sweeping promises to LGBTQ activists, proposing to carry out virtually every major proposal on their wish lists. One is to lift the Trump administration’s near-total ban on military service for transgender people. Biden also is backing a bill passed by the House last year that would extend federal anti-discrimination protections to LGBTQ people nationwide. But most Senate Republicans are wary, due in part to opposition from religious conservatives who say the measure threatens religious liberty. 711

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