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What Is a Solstice? The Longest and Shortest Days Explained

What Is a Solstice? The Longest and Shortest Days Explained
Live figures — calculated as this page loaded
Next June solstice
Monday, 21 June 2027 — UTC
Counting down
232 days away
Today
Sunday, 1 November 2026 · ISO week 44 · day 305 of the year

Computed on every visit from the time-zone database and standard astronomical formulas, so these never go stale. The article below is unchanged.

A solstice is the moment Earth’s tilt leans most directly toward or away from the sun, giving one hemisphere its longest day of the year and the other its shortest. Around 20–21 June, the North Pole tips sunward at its maximum 23.4 degrees, while around 21–22 December the roles reverse.

The word comes from the Latin solstitium, meaning “sun standing still,” because the sun’s rising and setting points pause and reverse direction along the horizon. How extreme these daylight variations feel depends entirely on latitude, from a difference of only minutes at the equator to the polar night above the Arctic Circle.

This guide explains daylight length across different cities, why temperature extremes lag behind the solstice, how calendar leap days shift the exact date, and how traditions from Stonehenge to Yalda mark the event.

Sources: The Seasons, the Equinox, and the Solstices

Frequently asked questions

What is the short answer?
See the summary above — the rest of this guide gives the detail, examples and the reasoning behind it.
Where do these figures come from?
Every date and time figure here is computed from published astronomical and calendar rules, not copied from other tables.
Can I calculate this myself?
Yes — the free tools on itsdately do the exact calculation for any date, city or calendar in seconds.

Related on itsdately: How Long Is a Day on Other Planets? · Why Are There 60 Seconds in a Minute? Blame Babylon · What Is an Equinox? The Two Days the Sun Crosses the Equator

Further reading: U.S. Naval Observatory Astronomical Applications

Yasir Hafeez

About Yasir Hafeez

Yasir Hafeez is the creator of itsdately a free, independent site for clear world time, calendars, and date tools.

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