Every year on 21 June, people around the world celebrate the International Day of the Celebration of the Solstice. Recognized by the United Nations, this special day honors one of nature’s most remarkable events and reminds us of the deep connection between people, culture, and the natural world.

A solstice occurs when the Sun reaches its highest or lowest point in the sky relative to Earth. There are two solstices each year. Around 21 June, the Northern Hemisphere experiences the summer solstice, the longest day of the year, while the Southern Hemisphere experiences the winter solstice, the shortest day of the year. Around 21 December, the opposite occurs.

For thousands of years, people have observed the solstices and celebrated them in different ways. Long before modern calendars existed, communities carefully observed the Sun’s movements to understand the changing seasons and guide agricultural, cultural, and spiritual activities. The position of the Sun helped people know when to plant crops, harvest food, and prepare for seasonal changes. As a result, solstices became important milestones in many societies around the world.

Agricultural Significance 

For many farming communities, the solstices have long served as important seasonal markers. In the Northern Hemisphere, the summer solstice occurs during a period of rapid plant growth, and is often associated with the harvesting of early crops such as strawberries, lettuce, peas, and certain grains. Historically, farmers used the longest day of the year as a reminder that the main growing season was well underway and that preparations for later harvests should begin.

In the Southern Hemisphere, where the June solstice marks the beginning of winter, farmers may focus on planting cool-season crops or preparing fields for the coming growing season. While modern agriculture relies on scientific calendars and weather forecasting, many gardeners and farmers still view the solstices as meaningful opportunities to observe seasonal changes, monitor crop development, and reconnect with the natural rhythms that influence food production.

Of course, trees and plants also respond to these seasonal cues, directing energy into growth, fruit production, or dormancy depending on the species and local climate.

“Stone Calendars” 

One of many interesting examples of this connection between people and the cosmos can be found in the town of Güímar on the island of Tenerife in Spain’s Canary Islands. There, visitors can see a group of stepped stone structures known as the Pyramids of Güímar.

The Pyramids of Güímar

Around the summer solstice, many people gather at the site to witness a remarkable phenomenon known as the “double sunset.” As the Sun sets, it first disappears behind a mountain peak, briefly reappears, and then sets again behind a nearby ridge. This rare optical effect can only be observed around the time of the summer solstice.

Researchers from the Institute of Astrophysics of the Canary Islands have studied the site and found that some of the structures are aligned with the summer and winter solstices. Although the exact purpose and history of the pyramids continue to be debated, the site highlights humanity’s long-standing fascination with the sky and demonstrates how closely people have observed seasonal cycles throughout history.

As our relationship and understanding with Mother Nature deepens, we can become better caretakers of our planet Earth. The solstice offers us an opportunity to pause and appreciate the natural systems that sustain life. Just as trees grow and adapt through changing seasons, our human communities also become stronger when they remain connected to the environment around them.

Today, many cultures continue to celebrate the solstice through festivals, music, dancing, storytelling, and community gatherings. In the Pyrenees Mountains of Europe, for example, communities have celebrated summer solstice fire festivals for generations. These traditions bring people together, strengthen community bonds, and help pass cultural knowledge from one generation to the next.

A gathering in the Pyrenees

The solstice also reminds us that although we live in different countries and cultures, we all share the same “common home, the same planet, and we experience the same cycles of nature. The Sun that rises over a forest in Brazil is the same Sun that shines on communities in India, Spain, Zimbabwe, Australia, and the United States. This shared connection can inspire us to work together for a healthier and more sustainable future.

So, on the 21st of June, we can take a moment to step outside and observe the natural world around us. We can watch the sunlight filtering through the trees, listen to the birds, or spend time in a local park or garden. We can consider how this sunlight is shared by all living beings on Earth and how we are all connected, or interdependent, as we recently explored.

The International Day of the Celebration of the Solstice is more than a mere astronomical event. It is a celebration of nature, culture, community, and the enduring relationship between humanity and the Earth!

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References:

United Nations: https://www.un.org/en/observances/solstice-day
Pirámides de Güímar:  https://www.piramidesdeguimar.es/en/discover/the-double-sunset/
Institute of Astrophysics of the Canary Islands (IAC): https://www.iac.es/

Images sources:

https://ich.unesco.org/en/RL/summer-solstice-fire-festivals-in-the-pyrenees-01073
https://www.piramidesdeguimar.es/en/discover/the-double-sunset/
https://www.weather.gov/abq/clifeatures_summersolstice