Coordinate model
Ushuaia is computed at 54.80°S, 68.30°W in America/Argentina/Ushuaia. The coordinate, not the country or timezone alone, controls the curve.
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Daylight curve
54.80°S · 68.30°W. 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
17.3h
2026-12-21
Shortest day
7.2h
2026-06-20
Average
12.2h
Δ seasonal
Today's solar window
Sunrise
9:50 AM
Solar noon
1:32 PM
Sunset
5:13 PM
Day length
7h 23m
Civil twilight (-6°)
9:06 AM to 5:58 PM
Nautical twilight (-12°)
8:19 AM to 6:44 PM
Astronomical twilight (-18°)
7:35 AM to 7:28 PM
Golden hour3h 18m total
9:22 AM to 11:01 AM · 4:02 PM to 5:41 PM
Blue hour33m total
9:06 AM to 9:22 AM · 5:41 PM to 5:58 PM
Seasonal checkpoints
March equinox
Mar 20
12h 12m
June solstice
Jun 21
7h 12m
September equinox
Sep 22
12h 9m
December solstice
Dec 21
17h 20m
Full-year edge cases: 0 polar-day entries and 0 polar-night entries in the 2026 curve.
City solar dossier
These rows bind the page to Ushuaia's coordinates, local timezone, annual daylight spread, twilight availability, and peer-city curve rather than a reusable sunrise template.
Ushuaia is computed at 54.80°S, 68.30°W in America/Argentina/Ushuaia. The coordinate, not the country or timezone alone, controls the curve.
10h 8m between Jun 20 (7h 12m) and Dec 21 (17h 20m).
Today resolves to sunrise 9:50 AM, solar noon 1:32 PM, and sunset 5:13 PM.
golden hour today 3h 18m; blue hour today 33m; longest golden-hour day Jun 21 — 3h 24m
282 days include astronomical darkness; 0 civil white-night days and 83 astronomical white-night days are modeled in 2026.
Moscow (10h 33m swing); Berlin (9h 11m swing); Amsterdam (9h 7m swing); London (8h 48m swing); Stockholm (12h 32m 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/ushuaia/ resolves to Ushuaia, Argentina; the route is generated only from the retained SUN_CITIES list.
54.80°S, 68.30°W; latitude band high-mid latitude band; Southern Hemisphere.
America/Argentina/Ushuaia 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 Dec 21 (17h 20m), shortest Jun 20 (7h 12m), average 12h 9m.
Fastest gain Aug 26 (+5m from the previous day); fastest loss Feb 7 (-5m from the previous day); closest 12-hour day Mar 23 at 11h 59m (-1m from 12h).
Today: sunrise 9:50 AM, solar noon 1:32 PM, sunset 5:13 PM.
Golden Jun 21 — 3h 24m; blue Dec 21 — 48m; civil Dec 21 — 1h 55m; astronomical night Jun 21 — 12h 14m.
282 days with astronomical darkness; 0 civil white-night days; 83 astronomical white-night days.
March equinox: 12h 12m; June solstice: 7h 12m; September equinox: 12h 9m; December solstice: 17h 20m
Moscow (10h 33m); Berlin (9h 11m); Amsterdam (9h 7m); London (8h 48m); Stockholm (12h 32m)
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
3h 18m golden hour today
Best annual golden-hour day: Jun 21 — 3h 24m. Blue-hour total today: 33m.
Astronomy
282 true-darkness days
Longest astronomical-night entry: Jun 21 — 12h 14m. Use local cloud cover and moon phase separately.
Outdoor routine
7h 23m daylight today
Sunrise 9:50 AM and sunset 5:13 PM are the practical day-boundaries for school runs, work windows, and outdoor activity.
Seasonal planning
10h 8m annual swing
December average 17h 12m; June average 7h 18m. This is the year-scale gap to check before travel or outdoor scheduling.
Travel comparison
10 retained peer curves
Ushuaia's closest daylight-pattern peers here include Moscow (10h 33m annual swing), Berlin (9h 11m annual swing), Amsterdam (9h 7m annual swing), London (8h 48m annual swing).
Civil-light risk
Full civil-twilight bound all year
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, America/Argentina/Ushuaia 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 America/Argentina/Ushuaia 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
131
Days at or above fourteen hours of sun.
10h-or-less days
126
Short-day entries at ten hours or below.
Fastest gain
Aug 26 (+5m from the previous day)
Fastest loss
Feb 7 (-5m from the previous day)
Closest 12-hour balance
Mar 23 at 11h 59m (-1m from 12h)
Brightest month
December average 17h 12m
Shortest month
June average 7h 18m
Year-round photographer planning
Combined morning + evening windows, computed for every UTC day of the year.
White-night counts
0 days without civil-twilight bound, 16 without nautical-twilight bound, 83 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 Ushuaia'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 Ushuaia's actual solar profile.