The sun and the clock in Trondheim (2026)
Trondheim lies at 10.4°E. Its time zone, UTC+1, is built around the 15°E meridian. The 4.6° gap between them means the clock runs roughly 18 minutes ahead of the sun: solar noon arrives at about 12:18 rather than 12:00. Under daylight saving the clocks move 60 minutes forward, widening the gap to 78 minutes and pushing solar noon to 13:18.
The longest day of 2026 is 22 June, with 20h 36m of daylight. The shortest is 22 December, with 4h 30m. The swing between them is 16h 6m. Close to the Arctic or Antarctic circle, the year swings hard between long light and long dark.
The earliest sunrise and the latest sunset do not land on the longest day. In Trondheim the sun comes up earliest on 21 June at 03:02, while the latest sunset waits until 23 June at 23:38. The equation of time is what separates them: the Earth's elliptical orbit and axial tilt move solar noon back and forth by several minutes over the year.
The sky stays usably light for a while after the sun goes down. In Trondheim that civil twilight runs about 47 minutes at the equinox, stretching to 74 minutes at the solstice.
Every figure in this section is computed from the city's own latitude, longitude and IANA time zone using NOAA solar algorithms (Spencer, 1971), accurate to about ±2 arcminutes below 65° latitude.