Summer Solstice 2026 — the longest light
Summer Solstice 2026
the longest light — 21 June, 08:26 UTC
On 21 June 2026 at 08:26 UTC , the sun stood at its furthest north and the northern day reached its longest.
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春分<br>Spring Equinox<br>20 March, 14:46 UTC
夏至<br>Summer Solstice<br>21 June, 08:26 UTC
秋分<br>Autumn Equinox<br>23 September, 00:06 UTC
冬至<br>Winter Solstice<br>21 December, 20:51 UTC
How this is computed<br>The sun's position uses the NOAA Solar Calculator (Spencer 1971 truncated series) — declination accurate to about 0.05°, the equation of time to about half a minute. The moon and the deep-time scrubber use Meeus, Astronomical Algorithms (2nd ed.). Ancient solar and lunar alignments are pinned from archaeological literature (Ruggles, Astronomy in Prehistoric Britain and Ireland), not derived from the model. Good for contemplation, not for navigation.