Coordinate model
Tromsø is computed at 69.65°N, 18.96°E in Europe/Oslo. The coordinate, not the country or timezone alone, controls the curve.
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Daylight curve
69.65°N · 18.96°E. Each vertical bar is one day of the year — bar height shows total daylight minutes.
Last updated recently. Daylight values are generated from the city coordinates and solar-position math during the page revalidation window.
Longest day
24.0h
2026-05-18
Shortest day
0.0h
2026-01-01
Average
12.6h
Δ extreme
Today's solar window
Polar day is active on this local date, so the sun does not set.
Day length
24h
Civil twilight (-6°)
— to —
Nautical twilight (-12°)
Sun never reaches -12° today
Astronomical twilight (-18°)
Sun never reaches -18° today
Golden hour
— · —
Blue hour
— · —
Seasonal checkpoints
March equinox
Mar 20
12h 18m
June solstice
Jun 21
24h
September equinox
Sep 22
12h 23m
December solstice
Dec 21
0h
Full-year edge cases: 69 polar-day entries and 48 polar-night entries in the 2026 curve.
City solar dossier
These rows bind the page to Tromsø's coordinates, local timezone, annual daylight spread, twilight availability, and peer-city curve rather than a reusable sunrise template.
Tromsø is computed at 69.65°N, 18.96°E in Europe/Oslo. The coordinate, not the country or timezone alone, controls the curve.
24h between Jan 1 (0h) and May 18 (24h).
The local-date snapshot is polar day: no sunset is modeled for this date.
no usable golden-hour window today; no usable blue-hour window today; longest golden-hour day May 5 — 7h 57m
191 days include astronomical darkness; 107 civil white-night days and 174 astronomical white-night days are modeled in 2026.
Reykjavík (17h 2m swing); Anchorage (13h 55m swing); Stockholm (12h 32m swing); Moscow (10h 33m swing); Ushuaia (10h 8m swing)
Solar evidence pack
This audit ties the page to a retained city route, exact coordinates, local timezone, a full-year daylight curve, twilight thresholds, and peer-city comparisons.
/sun/tromso/ resolves to Tromsø, Norway; the route is generated only from the retained SUN_CITIES list.
69.65°N, 18.96°E; latitude band polar latitude band; Northern Hemisphere.
Europe/Oslo is used to anchor today's local sunrise, sunset, solar noon, and twilight windows.
365 daily daylight rows were computed for 2026; expected 365.
Longest May 18 (24h), shortest Jan 1 (0h), average 12h 35m.
Fastest gain May 18 (+52m from the previous day); fastest loss Jul 26 (-59m from the previous day); closest 12-hour day Mar 18 at 12h 1m (+1m from 12h).
Today is modeled as polar day: no sunset on the local date.
Golden May 5 — 7h 57m; blue Aug 14 — 2h 51m; civil Nov 27 — 5h 36m; astronomical night Dec 21 — 13h 32m.
191 days with astronomical darkness; 107 civil white-night days; 174 astronomical white-night days.
March equinox: 12h 18m; June solstice: 24h; September equinox: 12h 23m; December solstice: 0h
Reykjavík (17h 2m); Anchorage (13h 55m); Stockholm (12h 32m); Moscow (10h 33m); Ushuaia (10h 8m)
Solar thresholds are NOAA-style; timezone rules use IANA. The page is a planning model, not a legal almanac or obstruction-aware site survey.
Practical read
Photography
No standard golden-hour window today
Best annual golden-hour day: May 5 — 7h 57m. Blue-hour window is absent or unbounded today.
Astronomy
191 true-darkness days
Longest astronomical-night entry: Dec 21 — 13h 32m. Use local cloud cover and moon phase separately.
Outdoor routine
24h daylight today
Polar regimes make ordinary commute-light assumptions unreliable on this local date.
Seasonal planning
24h annual swing
June average 24h; December average 0h. This is the year-scale gap to check before travel or outdoor scheduling.
Travel comparison
10 retained peer curves
Tromsø's closest daylight-pattern peers here include Reykjavík (17h 2m annual swing), Anchorage (13h 55m annual swing), Stockholm (12h 32m annual swing), Moscow (10h 33m annual swing).
Civil-light risk
107 civil white-night days
Civil twilight uses -6°. White-night counts matter because dawn/dusk phases stop behaving like ordinary morning/evening windows.
Calculation boundaries
What this model includes
Latitude, longitude, solar elevation thresholds, atmospheric-refraction sunrise/sunset convention, Europe/Oslo local formatting, and a 365-day sweep for 2026.
What this model excludes
Mountains, skyline obstruction, sea horizon differences, weather, smoke, cloud cover, local legal definitions, aviation rules, and observer elevation.
When to verify elsewhere
Use official observatory, aviation, maritime, legal, or local almanac sources for high-stakes operations; this page is designed for planning, comparison, and general reference.
Why city pages differ
Two cities in Europe/Oslo can still have different daylight and twilight curves because the coordinate pair, especially latitude, drives the result.
Seasonal daylight fingerprint
These values are derived from the same 365-day curve: threshold counts, fastest day-to-day change, the closest 12-hour balance, and monthly daylight averages.
14h+ daylight days
163
Days at or above fourteen hours of sun.
10h-or-less days
146
Short-day entries at ten hours or below.
Fastest gain
May 18 (+52m from the previous day)
Fastest loss
Jul 26 (-59m from the previous day)
Closest 12-hour balance
Mar 18 at 12h 1m (+1m from 12h)
Brightest month
June average 24h
Shortest month
December average 0h
Year-round photographer planning
Combined morning + evening windows, computed for every UTC day of the year.
White-night counts
107 days without civil-twilight bound, 143 without nautical-twilight bound, 174 without astronomical-twilight bound. On those days the sun never gets low enough for the named phase to occur, so true darkness disappears for that stretch.
Twilight phases reference
Solar elevation thresholds used on this page. All angles are measured from the true horizon at the city coordinate.
Sunrise / sunset · -0.833°
The sun's upper edge crosses the horizon. The negative value is atmospheric refraction (~34') plus the apparent solar disc radius (~16') — what almanacs call "official" sunrise/sunset.
Golden hour · 6° to -4°
Warm, low-angle light photographers and cinematographers plan around. Two windows per day — one in the morning, one in the evening.
Blue hour · -4° to -6°
Sky takes on deep, even blues; useful for cityscape photography because artificial lights and ambient sky balance.
Civil twilight · -6°
Brightest natural objects are still visible; outdoor activities don't need artificial light. Used in many legal definitions of dawn/dusk.
Nautical twilight · -12°
Horizon is just visible at sea, allowing celestial navigation; named for sailors taking sextant fixes.
Astronomical twilight · -18°
Sky is dark enough for deep-sky observation. After astronomical dusk and before astronomical dawn is when astrophotographers shoot.
Solar planning depth
Reference fields include Tromsø's route, coordinates, timezone, daylight extremes, twilight windows, white-night counts, peer curves, evidence checks, and calculation boundaries.
Frequently asked questions
These are selected by latitude and annual daylight swing, not by the generic city list, so the comparison is tied to Tromsø's actual solar profile.