Is today the longest day of the year? What to know about summer solstice.
The longest day of the year, and the official start of summer, has arrived in the U.S.
The summer solstice takes place Friday, June 20, and will be both the longest day and shortest night of 2025 in the Northern Hemisphere, according to the National Weather Service (NWS).
Recognized as a day of extra sunlight that ushers in warmer weather to come, the solstice is also celebrated in multiple cultures and religions. It marks the start of the Pagan holiday Litha, also known as Midsummer, which is famously celebrated at the ancient Stonehenge ruins in Wiltshire, England, where many gather to herald the season.
Here's what to know about the solstice.
What is the summer solstice?
The summer solstice marks the beginning of summer in the Northern Hemisphere and the longest day of the year. Meanwhile, the Southern Hemisphere will greet winter with its winter solstice.
When is the summer solstice?
The summer solstice will take place on Friday, June 20, at 10:42 p.m. ET, according to Space.com. The solstice itself only lasts moments, according to the Old Farmer's Almanac.
The date of the summer solstice can fall at any point between June 20 and June 22, depending on the year.
Why is the summer solstice the longest day of the year?
During the summer solstice, the Earth's tilt brings our planet's northernmost point closer to the sun, resulting in more hours of sunlight and fewer hours of night.
"The Northern Hemisphere's tilt toward the Sun is greatest on this day," according to NASA. "This means the Sun travels its longest, highest arc across the sky all year for those north of the equator."
Solstice marks time of celebration for some
Several locations around the world are particularly known for celebrating the solstice, including Newgrange in Ireland. Solstices are often associated with pagan religions and draw revelers of different faiths.
Pagans come by the thousands to Stonehenge, the prehistoric ruins of a monument built between approximately 3100 and 1600 BC in Wiltshire, England. It is one of the most famous landmarks in the U.K., but little is known about the civilization that built it or why, as these ancient peoples left no written records behind.
It was during the 20th century that Stonehenge became a site of religious significance to people who subscribed to New Age beliefs, including Neopaganism and Neo-Druids, according to USA TODAY's previous reporting. When constructed, the stone circle was aligned with the sun, and to this day, thousands of people gather to witness the moment the sun peeks perfectly through its pillars.
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Deep cuts to hurricane data could leave forecasters in the dark
Forecasters are set to lose some of their sharpest eyes in the sky just a few months before Atlantic hurricane season peaks when the Department of Defense halts a key source of satellite data over cybersecurity concerns. The data comes from microwave sensors attached to three aging polar-orbiting satellites operated for both military and civilian purposes. Data from the sensors is critical to hurricane forecasters because it allows them to peer through layers of clouds and into the center of a storm, where rain and thunderstorms develop, even at night. The sensors don't rely on visible light. Losing the data — at a time when the National Weather Service is releasing fewer weather balloons and the agency is short on meteorologists because of budget cuts — will make it more likely that forecasters miss key developments in a hurricane, several hurricane experts said. Those changes help meteorologists determine what level of threat a storm may pose and therefore how emergency managers ought to prepare. Microwave data offers some of the earliest indications that sustained winds are strengthening inside a storm. 'It's really the instrument that allows us to look under the hood. It's definitely a significant loss. There's no doubt at all hurricane forecasts will be degraded because of this,' said Brian McNoldy, a hurricane researcher and senior research associate at the University of Miami's Rosenstiel School of Marine, Atmospheric, and Earth Science. 'They're able to detect when an eye wall forms in a tropical storm and if it's intensifying — or rapidly intensifying.' Researchers think rapid intensification is becoming more likely in tropical storms as the oceans warm as a result of human-caused climate change. The three satellites are operated for both military and civilian purposes through the Defense Meteorological Satellite Program, a joint effort of the National Oceanic and Atmospheric Administration and the Department of Defense. While hurricane experts said they were concerned about losing the tool, Kim Doster, NOAA's communications director, downplayed the decision's effect on hurricane forecasting by the National Weather Service. In an email, Doster said the military's microwave data 'is a single dataset in a robust suite of hurricane forecasting and modeling tools in the NWS portfolio.' Doster said these models include data from geostationary satellites — a different system that constantly observes Earth from about 22,300 miles away and offers a vantage point that appears fixed because the satellites synchronize with Earth's rotation. 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Earlier this week, a division of the Navy notified researchers that it would cease to process and share the data on or before June 30, and some researchers received an email from the Navy's Fleet Numerical Meteorology and Oceanography Center, saying that its data storage and sharing program relied on a processing station that was using an 'end-of-life' operating system with vulnerabilities. 'The operating system cannot be upgraded, poses a cybersecurity concern, and introduces risk to DoD networks,' the email, which was reviewed by NBC News, said. The move will cut the amount of microwave data available to forecasters in half, McNoldy estimated. This microwave data is also used by snow and ice scientists to track the extent of polar sea ice, which helps scientists understand long-term climate trends. Sea ice forms from frozen ocean water. It grows in coverage during winter months and typically melts during warmer times of the year. 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Andy Hazelton, a hurricane modeler and associate scientist with the University of Miami Cooperative Institute for Marine & Atmospheric Studies, said the microwave data is used in some hurricane models and also by forecasters who can access near real-time visualizations of the data. Hazelton said forecasters are always looking for visual signatures in microwave data that often provide the first evidence a storm is rapidly intensifying and building strength. The National Hurricane Center defines rapid intensification as a 35-mph or higher increase in sustained winds inside a tropical storm within 24 hours. Losing the microwave data is particularly important now because in recent years, scientists have observed an increase in rapid intensification, a trend likely fueled in part by climate change as ocean waters warm. 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a day ago
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Astronomers solve mystery of strange bright burst in space
Around midday on June 13 last year, my colleagues and I were scanning the skies when we thought we had discovered a strange and exciting new object in space. Using a huge radio telescope, we spotted a blindingly fast flash of radio waves that appeared to be coming from somewhere inside our galaxy. After a year of research and analysis, we have finally pinned down the source of the signal – and it was even closer to home than we had ever expected. Our instrument was located at Inyarrimanha Ilgari Bundara – also known as the Murchison Radio-astronomy Observatory – in remote Western Australia, where the sky above the red desert plains is vast and sublime. We were using a new detector at the radio telescope known as the Australian Square Kilometre Array Pathfinder – or ASKAP – to search for rare flickering signals from distant galaxies called fast radio bursts. We detected a burst. Surprisingly, it showed no evidence of a time delay between high and low frequencies – a phenomenon known as 'dispersion'. This meant it must have originated within a few hundred light years of Earth. In other words, it must have come from inside our galaxy – unlike other fast radio bursts which have come from billions of light years away. Fast radio bursts are the brightest radio flashes in the Universe, emitting 30 years' worth of the Sun's energy in less than a millisecond – and we only have hints of how they are produced. Some theories suggest they are produced by 'magnetars' – the highly magnetised cores of massive, dead stars – or arise from cosmic collisions between these dead stellar remnants. Regardless of how they occur, fast radio bursts are also a precise instrument for mapping out the so-called 'missing matter' in our Universe. When we went back over our recordings to take a closer look at the radio burst, we had a surprise: the signal seemed to have disappeared. 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But we estimate the chance that the nanosecond burst we detected was caused by such an event to be about 1 per cent. Ultimately, we can't be certain why we saw this signal from Relay 2. What we do know, however, is how to see more of them. When looking at 13.8 millisecond timescales – the equivalent of keeping the camera shutter open for longer – this signal was washed out, and barely detectable even to a powerful radio telescope such as ASKAP. But if we had searched at 13.8 nanoseconds, any old radio antenna would have easily seen it. It shows us that monitoring satellites for electrostatic discharges with ground-based radio antennas is possible. And with the number of satellites in orbit growing rapidly, finding new ways to monitor them is more important than ever. But did our team eventually find new astronomical signals? You bet we did. And there are no doubt plenty more to be found. Clancy William James is a Senior Lecturer (astronomy and astroparticle physics) at Curtin University. This article is republished from The Conversation under a Creative Commons license. Read the original article.
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Meteor Fragments Hit the Southeast U.S. Here's What to Know
Aiken, South Carolina - June 26, 2025 Credit - Bryan Jennings Updyke The inner solar system is a lot calmer than it was 4 billion years ago, during what's known as the heavy bombardment period. Over the course of that violent stretch, which lasted about 500 million years, Mercury, Venus, Earth, Mars, and the moon were regularly pounded by asteroids, meteors, and other cosmic ordnance, many of the objects as big as the six-mile-wide rock that wiped out the dinosaurs. Things have gotten a lot quieter since then, but that's not to say everything has gone entirely still. Earth still lives inside a shooting gallery, with thousands of objects—totaling about 48.5 tons per year, according to NASA—entering the atmosphere. Yesterday, one of those space boulders exploded in the skies over Alabama, Tennessee, Georgia, North Carolina, and South Carolina at 11:51 a.m EDT, according to the National Weather Service (NWS). The brilliant flash, which was accompanied by a sonic boom that many mistook for an earthquake, resulted in hundreds of calls and posts to the American Meteor Society (AMS), NASA's recommended organization for reporting meteoric fireballs. In Henry County, Ga., one house was struck by debris that broke through the roof and landed inside the residence. There were no reported injuries. 'The Henry County Emergency Management Agency [EMA] passed along to us that a citizen reported that a 'rock' fell through their ceiling around the time of the reports of the 'earthquake,'' the NWS said in a Facebook post. 'Henry County EMA also reported that the object broke through the roof, then the ceiling, before cracking the laminate on the floor and stopping.' The possibility of something tumbling from the skies this week was not entirely unexpected. Yesterday's event occurred during the ongoing Bootid meteor shower, which happens once every 6.37 years, when Earth passes through the remnants of the tail of Comet 7P/Pons-Winnecke. The Bootid is just one of dozens of known showers the AMS lists on its website. Many of those events produce only a fine mist of meteor fragments, visible only at night in dark conditions away from city lights, and commonly called shooting stars. Yesterday's rock was of a decidedly greater caliber, one big enough to be classified as a bolide, a meteor with enough mass to cause a bright flash and a sonic boom as it slams into the atmosphere, but too small for most of it to reach the ground without being incinerated first. To qualify as a bolide, an incoming meteor must reach the brightness of Venus, which, like the moon, is often visible in the daytime sky. A few dozen bolides occur each year, according to NASA. The most explosive recent bolide event occurred over Chelyabinsk, Russia, on Feb. 15, 2013, when an object estimated to have measured about 65 ft., detonated in the atmosphere, injuring nearly 1,500 people and damaging 7,200 buildings. Modern history's biggest bolide also struck Russia, in the celebrated Tunguska event of 1908, when a 350-ft. meteor flattened 830 sq. mi. of forest land. Lesser meteoric fireworks are much, much more common than bolides. According to the AMS, several thousand small fireballs erupt in the atmosphere every day, but 'the vast majority of these,' the organization says, 'occur over the oceans and uninhabited regions, and a good many are masked by daylight.' Notwithstanding the Henry County house that got hit by the recent bolide, the odds of any one spot—or any one person—being struck by space debris are vanishingly small. Barely 5% of objects that enter the atmosphere survive the fires of entry and reach the surface. Roughly 70% of that surface is ocean and much of the rest is desert or other sparsely inhabited terrain. Finally, most of the meteorites that do strike the planet are, by the time of impact, micrometeorites—too small to do any damage at all. In all of known human history, in fact, there is only one person who is believed to have been killed by a meteorite—an Indian bus driver who was struck while walking on the campus of an engineering college in the state of Tamil Nadu on Feb. 6, 2016. That effectively puts your odds of meeting the same fate as one in the total number of human beings who have walked the Earth since the dawn of homo sapiens roughly 300,000 years ago. That's not to say there haven't been close calls. On May 1, 1860, a horse was killed by a meteorite strike in Concord, Ohio. In 1954, an Alabama woman—whose picture was published and story was told in the Dec. 13, 1954 issue of LIFE magazine—sustained severe bruising to her hand and side when a 10 lb. meteorite crashed through her roof while she lay napping on her sofa. Put yesterday's event in the category of lightning strikes or shark bites—theoretically possible, highly improbable, one more thing you can take off your worry list. Write to Jeffrey Kluger at
