International Sun Day
Date/heure
Date(s) - 21 June 2026
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June 21 marks International Sun Day, a date that coincides with the summer solstice in the northern hemisphere, the day with the most hours of daylight in the year. This day highlights the essential role of the Sun as a source of life and energy: thanks to it, natural cycles, photosynthesis, climate, and seasons exist, as well as being the basis of one of the main renewable energies, solar energy.
The choice of this date is no coincidence. June 21 marks an astronomical and cultural milestone celebrated for millennia by numerous civilizations and recognized by the United Nations as International Solstice Celebration Day. Today, International Sun Day is also associated with environmental awareness, promoting the use of clean energy, self-consumption, and energy transition, especially in countries with high solar potential such as Spain, where this source is key to moving towards a more sustainable and resilient energy model.
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