Astronomy for Change Celebrates the 2026 Summer Solstice with Two Jewels of the Summer Sky

Imaged with Insight Observatory's Remote Telescope Network

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As the 2026 Summer Solstice arrived on June 21 at 4:24 AM EDT, marking the longest day of the year in the Northern Hemisphere, Thomas Madigan from Astronomy for Change took the occasion to turn his attention to two of the most stunning deep-sky objects the summer sky has to offer — and he did it using Insight Observatory's world-class remote telescope network.

In a feature article published on the Astronomy for Change website, Dr. Daly explores the science behind the Summer Solstice — explaining how the Earth's 23.5-degree axial tilt, not its distance from the Sun, is responsible for the seasonal changes we experience — before guiding readers toward the southern summer sky and two spectacular globular clusters now well-placed for observation.

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Two Globular Clusters, Two Hemispheres, One Network
Leveraging Insight Observatory's remotely accessible 0.40-meter (16″) Ritchey-Chrétien Deep-Space Reflectors, Dr. Daly captured 16-minute exposures of both targets from opposite sides of the world:

Messier 22 imaged by Thomas Madigan on Insight Observatory's affiliate remote telescope, AFIL-19, located in Pie Town, New Mexico, USA.

Messier 22 in Sagittarius was imaged using Insight Observatory's instrument at Pie Town, New Mexico, USA. Located approximately 10,000 light-years from Earth, M22 is one of the brightest and most richly populated globular clusters in the night sky, harboring between 100,000 and 300,000 ancient stars.

Messier 4 imaged by Thomas Madigan on Insight Observatory's affiliate remote telescope, AFIL-40, located in the Rio Hurtado Valley, Chile.

Messier 4 in Scorpio was captured with Insight Observatory's telescope in the Rio Hurtado Valley, Chile. At just under 7,000 light-years distant, M4 is one of the closest globular clusters to Earth — a proximity that makes it appear notably larger in the field of view, even though its stellar population is comparable to M22. It can be found just west of Antares, the brilliant red giant heart of the scorpion.

Both clusters are currently well-placed in the southern sky through June and July and are accessible to backyard observers with a good pair of binoculars — a point Dr. Daly enthusiastically emphasizes in his article.

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Science Beyond the Image
What makes this collaboration particularly noteworthy is what Dr. Daly plans to do with the data next. In an upcoming follow-up post, he will release full-resolution images of both M22 and M4 alongside Hertzsprung-Russell (HR) diagrams generated using PixInsight's HR Plotter — a third-party add-on tool that produces scientifically valuable stellar classification diagrams directly from imaging data. The HR diagram, one of the most fundamental tools in stellar astrophysics, reveals a cluster's age, stellar composition, and evolutionary history — elevating these images from purely aesthetic works to scientifically meaningful datasets.

This kind of work is precisely the mission that drives the partnership between Astronomy for Change and Insight Observatory: combining the accessibility of remote telescope technology with rigorous scientific methodology and public education.

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About the Partnership
Insight Observatory's remotely accessible telescope network spans five continents, giving educators, researchers, and enthusiasts worldwide access to professional-grade instrumentation from their homes or classrooms. The collaboration with Astronomy for Change reflects a shared commitment to advancing public engagement with astronomy and making deep-sky observation accessible to all.

To read Mr. Madigan's full Summer Solstice 2026 article and view the complete imagery, visit: 🔗 https://astronomyforchange.org/summer-solstice-2026-and-two-favorite-celestial-jewels-of-the-summer-sky/