Today — June 20, 2024 — is the northern summer solstice. In the Northern Hemisphere, it marks the longest day of the year and the official start to summer.
We experience changing day lengths throughout the year because Earth rotates on a tilted axis as it goes around the Sun. This means during half of the year the North Pole tilts toward the Sun and in the other half it points away.
Solstices occur twice per year, when Earth’s poles are tilted closest to and farthest from the Sun.
The summer solstice is an important day for cultures around the world, especially at latitudes near the North Pole. Indigenous peoples have long marked the summer solstice with dancing and celebrations. Farmers have relied on the solstice to determine when to plant crops. The solstice’s timing also influenced the development of some calendars, like the ancient Roman calendar and the modern Gregorian calendar.
To mark the beginning of summer, here are four ways you can enjoy the Sun and the many wonders of space this season:
1. Check out the “Strawberry Moon”
June is the month of the Strawberry Moon. This name originates with the Algonquin tribes. June is when strawberries are ready for harvest in the northeastern United States, where the Algonquin people traditionally live. The full Strawberry Moon this year happens tomorrow night — June 21, 2024. Grab a pair of binoculars to see it in detail.
2. Celebrate the Heliophysics Big Year!
During the Heliophysics Big Year, we are challenging you to participate in as many Sun-related activities as you can. This month’s theme is performance art. We’re looking at how various kinds of performance artists are moved by the Sun and its influence on Earth. For example, check out this Sun song!
Find out how to get involved here: https://science.nasa.gov/sun/helio-big-year/.
3. Listen to a space-cast
NASA has a ton of great space podcasts. Take a listen to Curious Universe’s Here Comes the Sun series to learn all about our closest star, from how it causes weather in space, to how you can help study it! For even more podcasts, visit our full list here: https://www.nasa.gov/podcasts.
4. Make sunspot cookies
The Sun sometimes has dark patches called sunspots. You can make your own sunspots with our favorite cookie recipe. Real sunspots aren’t made of chocolate, but on these sunspot cookies they are. And they're delicious.
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