Summer Solstice 2025: The Exact Time For Every U.S. State
The 2025 solstice — the longest day of the year in the Northern Hemisphere and the shortest in the Southern Hemisphere — will occur at 02:42 UTC on Saturday, June 21. However, in North America, it happens the previous day.
People watch the sun rise, as they take part in the Summer Solstice at Stonehenge in Wiltshire, ... More Friday, June 21, 2024. (Andrew Matthews/PA Wire/PA via AP)
June's solstice marks the longest day of the year and the beginning of astronomical summer in the Northern Hemisphere. It's not only the longest day but also the point when daylight begins to shorten.
The solstice occurs at a specific global time (02:42 UTC on June 21), so its local time varies across U.S. time zones. The 2025 summer solstice occurs at 10:42 p.m. EDT, 9:42 p.m. CDT, 8:42 p.m. MDT, 7:42 p.m. PDT, 6:42 p.m. AKDT and 4:42 p.m. HST on Friday, June 20.
At that precise moment, the sun will be directly overhead at the Tropic of Cancer at noon somewhere on Earth. It's the northernmost point of the sun at noon.
Solstice is from the Latin solstitium, sol meaning sun and stit being stationary. That's because, as a consequence of the sun reaching its highest in the sky in the Northern Hemisphere, its rise and set points are at their extreme northeast and northwest, respectively. To the observer, the sun appears to rise farther northeast until June's solstice, when it appears to stand still for a few mornings before rising farther east and south.
Although Stonehenge is traditionally associated with the solstice (it's aligned with the rising sun on the solstice), there are other ancient monuments with a solstice link. Egypt's Nabta Playa stone circle, the oldest known astronomical site, tracks the solstice, with no shadows cast by its stones at noon on the date of the solstice. According to Astronomy magazine, Nabta Playa was constructed by a cattle-worshiping cult of nomadic people to mark the summer solstice and the arrival of the monsoons. At 7,000 years old, it's older than Stonehenge.
The 2025 solstice will occur at 02:42 UTC on Saturday, June 21, 2025.
The Tropic of Cancer is a line 23.4 degrees north of the Earth's equator through The Bahamas, Mexico, Egypt, Libya, Niger, Algeria, Mauritania, Mali, Chad, Saudi Arabia, United Arab Emirates, Oman, India, Myanmar, China and Taiwan. It reflects the tilt of the Earth's axis, which explains why the planet has solstices, equinoxes and seasons.
The beginning of astronomical seasons is marked by solstices and equinoxes (equinox means equal night when there are 12 hours of daylight and 12 hours of darkness). The spring or vernal equinox occurs between March 19-21, the June solstice June 20 and 22, the September equinox September 21-24 and the December solstice is December 20-23, according to Timeanddate.com. In 2025, they occur on March 20, June 20, Sept. 22 and Dec. 21, respectively.
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Yahoo
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The summer solstice is today. Here's what to expect on the 1st day of summer.
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Tandem Diabetes Care Announces t:slim X2™ Insulin Pump Compatibility with Abbott's FreeStyle Libre® 3 Plus Sensor in the United States
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"The American Diabetes Association recommends AID systems as the preferred insulin delivery method in people with type 1 and other types of insulin-deficient diabetes, and this integration with Abbott's latest generation sensor allows even more CGM users to access the life-changing benefits of our Control-IQ+ technology." The FreeStyle Libre 3 Plus sensor has an extended 15-day wear time, transmitting automatic glucose readings every minute directly to the pump. This data is also available to view on the Tandem t:slim mobile app, providing users with multiple, convenient ways to access their current glucose trend. The t:slim X2 insulin pump is powered by Control-IQ+ technology, the latest generation of Tandem's advanced hybrid closed-loop algorithm, which adjusts insulin every 5 minutes based on predicted glucose values. It's the only system with the unique AutoBolus™ feature that calculates and delivers a correction bolus to help with missed meal boluses.* Control-IQ+ is easy to start, use, and personalize, and this latest integration works with the FreeStyle Libre 3 Plus sensor and extends its benefits to even more people with diabetes. "This is an exciting first step in our strategy to connect Tandem's portfolio of insulin pumps to Abbott's FreeStyle Libre 3 Plus sensors worldwide," said John Sheridan, president and chief executive officer of Tandem Diabetes Care. "We look forward to expanding access to our t:slim X2 users outside of the U.S. beginning later this year." When available, Tandem will email eligible users in the U.S. with more information.† About Tandem Diabetes CareTandem Diabetes Care, a global insulin delivery and diabetes technology company, manufactures and sells advanced automated insulin delivery systems that reduce the burden of diabetes management, while creating new possibilities for patients, their loved ones, and healthcare providers. The Company's pump portfolio features the Tandem Mobi system and the t:slim X2 insulin pump, both of which feature Control-IQ+ advanced hybrid closed-loop technology. Tandem Diabetes Care is based in San Diego, California. For more information, visit Follow Tandem Diabetes Care on X @tandemdiabetes; use #tslimX2 #TandemMobi and # Tandem Diabetes Care on Facebook at Tandem Diabetes Care on LinkedIn at Forward Looking StatementsThis press release contains "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These forward-looking statements relate to, among other things, our ability to provide the software update for current t:slim X2 pump users and the t:slim X2 pumps pre-loaded with Freestyle Libre 3 Plus sensor integration software. These statements are subject to numerous risks and uncertainties, including our ability to sustain commercial scale manufacturing of the t:slim X2 pumps pre-loaded with Freestyle Libre 3 Plus sensor integration software, our ability to operate and maintain a system to facilitate online training for existing t:slim X2 pump customers upgrading their existing devices, and the risk that we may encounter other challenges that may delay the availability of the software update for current t:slim X2 pump users or the t:slim X2 pumps pre-loaded with Freestyle Libre 3 Plus sensor integration software. These and other risks are identified and described in greater detail under the "Risk Factors" heading of our most recent Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, and other documents filed with the Securities and Exchange Commission. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date of this release. Actual results could differ materially from those anticipated or projected in the forward-looking statements. Tandem undertakes no obligation to update or review any forward-looking statement in this press release because of new information, future events, or other factors. Important Safety Information – FreeStyle Libre SystemsProduct for prescription only; for Important Safety Information, please visit Important Safety Information – Tandem Diabetes CareRX ONLY. The t:slim X2 pump with interoperable technology (the pump) and Control-IQ+ technology (Control-IQ+) are intended for single patient use. The pump and Control-IQ+ are indicated for use with NovoLog or Humalog U-100 insulin. t:slim X2 insulin pump: The pump is intended for the subcutaneous delivery of insulin, at set and variable rates, for the management of diabetes mellitus in persons requiring insulin. 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Tandem Diabetes Care, the Tandem logo, Control-IQ+, t:slim X2, t:slim, and Tandem Mobi are either registered trademarks or trademarks of Tandem Diabetes Care, Inc. in the United States and/or other countries. The sensor housing, FreeStyle, Libre, and related brand marks are marks of Abbott and used with permission. All other third-party marks are the property of their respective owners. * If glucose values are predicted to be above 180 mg/dL (or 10.0 mmol/L), Control-IQ technology calculates a correction bolus using the Personal Profile settings and a target of 110 mg/dL (or 6.1 mmol/L) and delivers 60% of that value. † Future updates for all or some Tandem products may not be developed and may not be offered everywhere and would be subject to applicable regulatory approvals. Software updates are only available to customers who are in warranty at the time they update their pump. Additional training may be required to access certain software updates. Charges may apply. Tandem may discontinue select software and features over time at its discretion. View source version on Contacts Media Contact: 858-366-6900media@ Investor Contact: 858-366-6900IR@ Error in retrieving data Sign in to access your portfolio Error in retrieving data Error in retrieving data Error in retrieving data Error in retrieving data
Gizmodo
an hour ago
- Gizmodo
New Study Backs Controversial Claim of 23,000-Year-Old Human Footprints in New Mexico
New research suggests the first Americans weren't who we thought they were. In 2021, researchers working in New Mexico published a paper that contributed to what remains one of the most controversial topics in American archaeology. The study describes human footprints in White Sands National Park dating to between 23,000 and 21,000 years ago, making them the oldest-known footprints in North America. This challenges long-held beliefs that the first North Americans were the Clovis people—named after artifacts found near Clovis, New Mexico—who arrived between 13,000 and 13,500 years ago during a relatively warm window near the end of the last Ice Age. Because footprints can't be directly dated, researchers estimated the age of these trace fossils—between 23,000 and 21,000 years old—by radiocarbon dating seeds found in the layers above and below the tracks. While critics continue to argue that the ancient seeds do not accurately represent the site's age, new research published earlier this week in the journal Science Advances adds further support to the original findings. As such, the seeds of the aquatic plant Ruppia cirrhosa are making another appearance at center stage in this debate. 'The issue of the arrival of the first Americans has long been contentious and the record from the White Sands locality generated considerable debate focused on the validity of the dating,' wrote the researchers in the new study, including University of Arizona archaeologist and geologist Vance Holliday, a co-author of the 2021 paper. 'This paper presents the results of an independent stratigraphic study with new associated dates, largely from a third source of radiocarbon that supports the initial dating.' In short, Holliday and his colleagues radiocarbon-dated new organic material, including Ruppia seeds, from new geological layers associated with the footprints. The team's new age estimate for the layers containing the footprints is between 23,000 and around 17,000 years ago, which overlaps with the original estimate of between 23,000 and 21,000 years ago. Radiocarbon dates of organic-rich sediments in one of the study areas, Gypsum Overlook, align more closely with the original estimate, yielding between around 22,400 years ago and 20,700 years ago. If the footprints are 23,000 years old, that means humans arrived in North America before the Last Glacial Maximum—when ice essentially created a barrier from the North Atlantic to the North Pacific coasts around 20,000 years ago. Even if the footprints are just 17,000 years old, that would still suggest that humans arrived in North America before the end of the last Ice Age around 11,700 years ago. 'This is a paradigm shift in the way we think about the peopling of the Americas, and human evolution more widely,' Nicholas Felstead, a researcher from Swansea University's Department of Geography who did not participate in the study, told Gizmodo in an email. 'This all but confirms multiple migration routes into the Americas, other than just the ice-free corridor around 14,000 years ago.' Early humans likely reached the Americas by island-hopping along the Bering Sea and Pacific coast, crossing the massive ice sheets of the Northern Hemisphere, or possibly drifting across the Pacific or Atlantic Oceans, Felstead explained. According to Karen Moreno, a paleobiologist at Austral University of Chile, the new research aligns with evidence from South American sites such as Monte Verde, Pilauco, Pedra Furada, and Arroyo del Vizcaino. The evidence from these sites suggest a human presence dating back 16,000 to 20,000 years ago, if not 30,000 years ago. 'South American evidence has certainly been overlooked, and I'm happy to know that North American work is finally pointing out to the direction our research in the South was supporting,' Moreno, who wasn't involved in the new study, told Gizmodo in an email. A study published in April, however, seems to call into question—once again—the validity of radiocarbon dating organic matter from the White Sands site. The main point of contention centers on what's known as the hard water effect. The effect occurs when aquatic plants like Ruppia draw carbon from groundwater, unlike terrestrial plants, which absorb carbon from the atmosphere, David Rachal, a geoarchaeologist with Vieja Consulting and a co-author of the April study, explained to Gizmodo in an email. The carbon in groundwater consists of very old dissolved limestone, which makes aquatic plants appear much older than they actually are in radiocarbon dating. As such, the hard water effect is 'baked in' to both the Ruppia seeds and other organic material from the mud layers in question, Rachal explained. 'According to their model, if the Ruppia grew within the site under these uniform-like conditions, shallow water, very well aerated, then the hard water effect is not a problem,' he said. Rachal and his colleague's model, however, indicates that the plant did not grow at the site, but rather washed into it. 'There's zero physical evidence that the plant grew within the site. And if it didn't grow within the site, the hard water effect is still there.' As such, any other samples that match the Ruppia seeds dates are also problematic, he added. Even without considering the hard water effect, 23,000-year-old footprints still raise more questions than it answers, according to Ben Potter, a University of Alaska Fairbanks anthropologist who also did not participate in the study. Namely, because they left no other known traces for 10,000 years. 'We need actual human-produced artifacts to understand the identity, behaviors, and potentially fate of these populations,' he told Gizmodo in an email. Ultimately, today's study represents the most recent volley in the highly contentious first-Americans debate. The ball is once again in the opposing side's court, and I'm sure their response will not take long.
