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.
Daylight curve
Daylight in Ushuaia, 2026
54.80°S · 68.30°W. Each vertical bar is one day of the year — bar height shows total daylight minutes.
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
6h
12h
18h
24h
J
F
M
A
M
J
J
A
S
O
N
D
Today's solar window
Sun and twilight in Ushuaia
Sunrise
5:35 AM
Solar noon
1:16 PM
Sunset
8:57 PM
Day length
15h 22m
Civil twilight (-6°)
4:52 AM to 9:41 PM
Nautical twilight (-12°)
3:53 AM to 10:39 PM
Astronomical twilight (-18°)
2:23 AM to 12:09 AM
Golden hour2h 36m total
5:09 AM to 6:27 AM · 8:05 PM to 9:23 PM
Blue hour35m total
4:52 AM to 5:09 AM · 9:23 PM to 9:41 PM
Seasonal checkpoints
Solstice and equinox anchors
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
Ushuaia daylight facts that are not generic
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.
Annual daylight spread
10h 8m between Jun 20 (7h 12m) and Dec 21 (17h 20m).
Local-date snapshot
Today resolves to sunrise 5:35 AM, solar noon 1:16 PM, and sunset 8:57 PM.
Photographer signal
golden hour today 2h 36m; blue hour today 35m; longest golden-hour day Jun 21 — 3h 24m
Darkness and white-night risk
282 days include astronomical darkness; 0 civil white-night days and 83 astronomical white-night days are modeled in 2026.
Best comparison anchors
Moscow (10h 33m swing); Berlin (9h 11m swing); Amsterdam (9h 7m swing); London (8h 48m swing); Stockholm (12h 32m swing)
Solar evidence pack
Why this Ushuaia sun page is retained
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.
12/12checks
Retained city route
pass/sun/ushuaia/ resolves to Ushuaia, Argentina; the route is generated only from the retained SUN_CITIES list.
Coordinate precision
pass54.80°S, 68.30°W; latitude band high-mid latitude band; Southern Hemisphere.
Local timezone
passAmerica/Argentina/Ushuaia is used to anchor today's local sunrise, sunset, solar noon, and twilight windows.
Full-year daylight curve
pass365 daily daylight rows were computed for 2026; expected 365.
Annual extremes
passLongest Dec 21 (17h 20m), shortest Jun 20 (7h 12m), average 12h 9m.
Seasonal momentum
passFastest 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).
Local-day solar snapshot
passToday: sunrise 5:35 AM, solar noon 1:16 PM, sunset 8:57 PM.
Twilight ladder
passGolden Jun 21 — 3h 24m; blue Dec 21 — 48m; civil Dec 21 — 1h 55m; astronomical night Jun 21 — 12h 14m.
Darkness and white-night model
pass282 days with astronomical darkness; 0 civil white-night days; 83 astronomical white-night days.
Seasonal checkpoints
passMarch equinox: 12h 12m; June solstice: 7h 12m; September equinox: 12h 9m; December solstice: 17h 20m
Peer curve comparison
passMoscow (10h 33m); Berlin (9h 11m); Amsterdam (9h 7m); London (8h 48m); Stockholm (12h 32m)
Method and citation boundary
passSolar 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
How to use this solar profile
Photography
2h 36m golden hour today
Best annual golden-hour day: Jun 21 — 3h 24m. Blue-hour total today: 35m.
Astronomy
282 true-darkness days
Longest astronomical-night entry: Jun 21 — 12h 14m. Use local cloud cover and moon phase separately.
Outdoor routine
15h 22m daylight today
Sunrise 5:35 AM and sunset 8:57 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 can and cannot promise
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
How daylight changes through 2026
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
Golden & blue hour across 2026
Combined morning + evening windows, computed for every UTC day of the year.
- Longest golden hour day
- Jun 21 — 3h 24m
- Shortest non-zero golden hour day
- Mar 18 — 2h 19m
- Year-round daily average
- 2h 44m
- Longest blue hour day
- Dec 21 — 48m
- Blue-hour daily average
- 33m
- Longest civil twilight
- Dec 21 — 1h 55m
- Civil twilight average
- 1h 25m
- Longest astronomical night
- Jun 21 — 12h 14m
- Days with true darkness
- 282 / 365
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
What each phase means
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
What the Ushuaia daylight curve means
This section turns the chart into readable planning context: latitude, seasonal range, monthly checkpoints, and how the curve should be used.
Solar fingerprint
Ushuaia, Argentina is modeled at 54.80°S, 68.30°W in America/Argentina/Ushuaia. That coordinate pair drives every bar in the 2026 daylight curve.
Seasonal swing
The longest day is Dec 21 at 17h 20m; the shortest is Jun 20 at 7h 12m. The yearly range is 10h 8m, which makes this a large seasonal daylight profile.
Latitude context
Ushuaia sits in the Southern Hemisphere high-mid latitude band. Latitude is the main reason two cities in the same timezone can have very different sunrise, sunset, and day-length patterns.
Monthly anchors
Useful checkpoints in this curve: Jan 15 16h 40m, Mar 15 12h 35m, Jun 15 7h 14m, and Sep 15 11h 39m. These anchors help readers see the shape of the year without reading all 365 bars one by one.
Today and twilight
Today in Ushuaia, sunrise is about 5:35 AM, sunset about 8:57 PM, solar noon 1:16 PM, and daylight totals 15h 22m. Civil twilight runs 4:52 AM to 9:41 PM; golden hour windows are 5:09 AM to 6:27 AM and 8:05 PM to 9:23 PM.
Golden hour planning
Today's combined morning + evening golden hour totals 2h 36m. The longest combined golden hour day of 2026 is Jun 21 — 3h 24m. The shortest non-zero day is Mar 18 — 2h 19m. Year-round average is 2h 44m per day across days where a golden-hour window exists.
Twilight ladder
Nautical twilight today: 3:53 AM to 10:39 PM. Astronomical twilight today: 2:23 AM to 12:09 AM. The single longest stretch of true astronomical darkness in 2026 occurs on Jun 21 — 12h 14m. 282 days in 2026 include at least some astronomical darkness. 83 astronomical white-night days (the sun never reaches -18°), so true darkness disappears for that stretch.
Seasonal momentum
Fastest daily daylight gain: Aug 26 (+5m from the previous day). Fastest daily daylight loss: Feb 7 (-5m from the previous day). Closest 12-hour balance: Mar 23 at 11h 59m (-1m from 12h). Average-month anchors: December average 17h 12m is brightest, while June average 7h 18m is shortest. 131 days reach 14h+ daylight; 126 days stay at 10h or less.
Blue and civil light
Today's combined blue hour totals 35m. The longest combined blue-hour day is Dec 21 — 48m. Blue-hour average is 33m per usable day. The longest civil-twilight-only day is Dec 21 — 1h 55m. Civil twilight averages 1h 25m where both dawn and dusk edges exist.
Sunrise and sunset are approximations for planning and comparison. For legal, aviation, photography, or scientific use, verify with a local almanac or official observatory source.
Frequently asked questions
Ushuaia sun questions
- When is golden hour in Ushuaia?
- Today, the evening golden hour in Ushuaia runs 8:05 PM to 9:23 PM; the morning window is 5:09 AM to 6:27 AM. Combined total today is 2h 36m. Across 2026, the longest combined golden-hour day is Jun 21 — 3h 24m.
- When does civil twilight start and end in Ushuaia?
- Civil twilight in Ushuaia today runs 4:52 AM to 9:41 PM. It's the period when the sun is between -0.833° and -6° elevation; the brightest stars become visible at the dusk boundary.
- What is the longest astronomical-night day of the year in Ushuaia?
- Ushuaia's longest stretch of true astronomical darkness in 2026 is Jun 21 — 12h 14m. Astronomical twilight ends when the sun reaches -18° elevation; only beyond that do deep-sky targets become observable.
- Are there white nights in Ushuaia?
- 0 days without a civil-twilight bound, 16 without a nautical-twilight bound, 83 without an astronomical-twilight bound. On those days the sun never falls low enough for the named phase to occur, so true darkness disappears for that stretch of 2026.
Comparable daylight curves
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.