Crozon tides today
- Tide now 4.1 ft ↓ falling · low 12:39 am (3.2 ft)
- Best time tomorrow 6:00–6:40 pm good day · 8/10
- Beach day Not today Not a beach day · 0/10
- Waves · water 5.4 ft · 58 °F moderate · 10.8 s from the west
- Wind · air 5 mph · 49 °F from the SE, gusts 9 · overcast
- Sun 7:57 am–6:06 pm 10 h 9 min of daylight
- Moon 93% · 7:05 pm waning gibbous · rises at 7:05 pm
- Diving tomorrow 12:10–1:30 pm average day · 6/10
Today in Crozon there are high tides at 5:53 am (22.6 ft) and 6:17 pm (22.4 ft) and low tide at 12:19 pm. Tide coefficient 99. Right now the tide is falling toward the low tide at 12:39 am. The sun rises at 7:57 am and sets at 6:06 pm: 10 h 9 min of daylight. The moon is 93% illuminated (waning gibbous) and rises at 7:05 pm. Major solunar periods run from 1:41 am to 3:41 am and from 2:12 pm to 4:12 pm. The next spring tides arrive from October 26 to 28. The sea is moderate, with 5.4 ft waves. There's a light breeze from the southeast (5 mph). Overcast, 49 °F.
Fishing in Crozon today
Best time to fish
Solunar activity today: high- High tide at 6:17 pm, coefficient 97
- Minor period 6:35–7:35 pm (moonrise)
- Sunset at 6:06 pm, golden hour from 5:21 pm
- Rising pressure (+0.19 inHg in 24 h), almost no wind and 6.6 ft waves
- Waning gibbous: a bit more activity than at the quarters
- Highest tide coefficient today: 99 (spring tides)
- A minor period lines up with sunset
Your day at a glance
The best window, 5:20 pm to 6:40 pm, combines the 6:17 pm high tide, moonrise and sunset, though with rising pressure. Also worth a try from 11:20 am to 1:20 pm, with the 12:19 pm low tide, moonset and a light onshore breeze, though with rising pressure.
Species with the most records nearby: ballan wrasse, small-spotted catshark, European conger and common cuttlefish. October is one of the months when these are seen most: ballan wrasse and pollack. What you can catch
Beach day in Crozon
Is it a beach day?
- Onshore breeze (8 mph)
- Low tide at 12:19 pm: more sand
- Cloudy (91% cloud cover)
- Feels like 56 °F: chilly for the beach
- Dangerous for swimming: 8.2 ft waves every 12 s; high rip current risk
- Water at 58 °F (very cold)
Dangerous surf during beach hours. Stay out if the red flag is up, and never swim where there is no lifeguard.
Today, hour by hour
- Swimming Dangerous · 8.2 ft
8.2 ft waves every 12 s: dangerous for swimming. Stay out if the red flag is up. High rip current risk. If you're caught in a rip current, don't swim against it: swim parallel to shore and wave for help. Always follow the lifeguard's flags.
- Water 58 °F
Very cold: ease in and keep swims short.
- Sun & sunscreen UV 1 · SPF 15
Max UV 1 (low): SPF 15 sunscreen.
- Wind 8 mph
Onshore breeze (8 mph).
- Tide & sand 12:19 pm
Low tide at 12:19 pm: that's when there's the most sand. High tide at 5:53 am and 6:17 pm. Coefficient 99 (spring tides): little sand left at high tide.
We don't have data on jellyfish, sargassum or beach closures: ask the lifeguard or check with the local beach authority. How it works · The next 7 days
Beaches near Crozon
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Plage du Porzic 0.7 mi · S
- Restrooms
- Parking
Excellent water quality 2025 season, EEA
- Plage de Postolonnec 1.3 mi · SE
- Restrooms
- Parking
Poor water quality 2025 season, EEA
- Traezh Morgad 1.3 mi · SW
- Restrooms
- Parking
Excellent water quality 2025 season, EEA
- Porzh Leon 2.2 mi · S
- Plage de l'Aber 2.4 mi · SE
- Restrooms
- Parking
Excellent water quality 2025 season, EEA
- Plage de Goulien 2.6 mi · W
- Restrooms
- Parking
Excellent water quality 2025 season, EEA
- Plage de Kersiguénou 2.9 mi · W
- Parking
Excellent water quality 2025 season, EEA
- Plage de la Source 3.2 mi · SE
- Parking
Named beaches within 6.2 mi, nearest first. Amenities from OpenStreetMap: some may be missing or out of date. View on OpenStreetMap · Add or fix on OpenStreetMap
Beaches and amenities: © OpenStreetMap contributors (ODbL). Bathing water quality: European Environment Agency (EEA), with data from the French Ministry of Health (baignades.sante.gouv.fr).
Webcams near Crozon
Webcams provided by windy.com — add a webcam
Tides in Crozon
Today's high and low tides
- ▲ High tide 5:53 am 22.6 ft · coef. 99
- ▼ Low tide 12:19 pm 2.7 ft
- ▲ High tide 6:17 pm 22.4 ft · coef. 97
↓ Falling The tide is falling. 51 min to low tide at 12:39 am.
Tide coefficient 99 for the 5:53 am high tide and 97 for the 6:17 pm high tide. Spring tides. The water rises and falls 19.9 ft between the highest high and the lowest low: a large range for this place. 70 is an average tide here; 90 and above means spring tides; below 45, neap tides. What is the tide coefficient?
2026 extremes: the highest tide of the year is on March 21 (23.3 ft) and the lowest, on August 14 (1.4 ft).
Semidiurnal: two high and two low tides a day, of similar height.
Heights above chart datum: the lowest astronomical tide (LAT), the zero of nautical charts in Europe. Astronomical prediction: wind and air pressure can raise or lower the water by a few inches, and more in a storm. Not for navigation. chart datum (LAT)
Tide coefficient and range in October
The biggest tides of the month came from October 26 to 28 (coefficient 101, 20.3 ft range). The smallest, on October 19 (coefficient 26, 5.8 ft).
Tide and solunar table · this week
| Day | Sun | Tide 1 | Tide 2 | Tide 3 | Tide 4 | Coef. | Moon | Major periods | Activity |
|---|---|---|---|---|---|---|---|---|---|
| Today, Wed 28 | 7:57 am · 6:06 pm | High tide 5:53 am · 22.6 ft | Low tide 12:19 pm · 2.7 ft | High tide 6:17 pm · 22.4 ft | — | Coef. 99 | 93% | Major periods 1:41 am · 2:12 pm | High |
| Thu 29 | 7:59 am · 6:04 pm | Low tide 12:39 am · 3.2 ft | High tide 6:35 am · 22.1 ft | Low tide 1:05 pm · 3.3 ft | High tide 7:01 pm · 21.4 ft | Coef. 93 | 85% | Major periods 2:44 am · 3:16 pm | Medium |
| Fri 30 | 8:00 am · 6:02 pm | Low tide 1:25 am · 4.2 ft | High tide 7:19 am · 21.2 ft | Low tide 1:54 pm · 4.4 ft | High tide 7:48 pm · 20.0 ft | Coef. 83 | 76% | Major periods 3:49 am · 4:21 pm | Medium |
| Sat 31 | 8:02 am · 6:01 pm | Low tide 2:15 am · 5.5 ft | High tide 8:09 am · 19.9 ft | Low tide 2:49 pm · 5.6 ft | High tide 8:44 pm · 18.5 ft | Coef. 69 | 66% | Major periods 4:52 am · 5:22 pm | Medium |
| Sun 1 | 8:03 am · 5:59 pm | Low tide 3:13 am · 6.8 ft | High tide 9:10 am · 18.6 ft | Low tide 3:54 pm · 6.8 ft | High tide 9:56 pm · 17.2 ft | Coef. 56 | Last quarter | Major periods 5:50 am · 6:18 pm | Medium |
| Mon 2 | 8:05 am · 5:58 pm | Low tide 4:21 am · 7.7 ft | High tide 10:28 am · 17.7 ft | Low tide 5:11 pm · 7.3 ft | High tide 11:26 pm · 16.8 ft | Coef. 48 | 43% | Major periods 6:44 am · 7:09 pm | Medium |
| Tue 3 | 8:06 am · 5:56 pm | Low tide 5:40 am · 7.9 ft | High tide 11:59 am · 17.7 ft | Low tide 6:32 pm · 7.1 ft | — | Coef. 49 | 33% | Major periods 7:34 am · 7:57 pm | Medium |
▲ high tide · ▼ low tide · heights above chart datum (LAT). Major periods: start time; they last 2 hours. Activity: based on the moon phase and the solunar periods.
Where this tide comes from
Crozon has no station of its own, so we use the tide at Brest (TICON-4), 9.4 mi away. On the open coast the difference is usually a few minutes and inches; inside estuaries, rivers and enclosed bays it can be much larger.
Station data attribution: Slackwater database (https://github.com/openwatersio/slackwater-database). Source: Hart-Davis, M., Dettmering, D., Seitz, F. (2025), TICON-4: TIdal CONstants based on GESLA-4 sea-level records, SEANOE, https://doi.org/10.17882/109129. Licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Modified: see https://github.com/openwatersio/slackwater-database#modifications-to-source-data
The sea at Crozon
Sea stateSea state: moderate
The waves you may find
- Most commonMost common2.7 ft
- Significant5.4 ft
- Highest expectedHighest11 ft
One wave in seven is higher than the significant height, and about 3 times a day one reaches 11 ft. Before heading out, expect waves of up to 11 ft.
Wind on the coast and offshore
Cross-offshore wind. The coast faces west and the wind comes off the land at an angle: calmer water near the shore, and bait and boats drift out to sea.
Wave height, next 7 daysWaves, next 7 days
Waves ease over the next few days. The biggest waves arrive on Wednesday 28: 9.1 ft with a period of 12 s, from the west (rough).
Water temperature
Water temperature →Water temperature changes how fish behave: in very cold or very warm water they feed less. The water cools over the next few days: about 56.8 °F by Tuesday 3.
Water about normal for late October.
Satellite: NASA MUR (JPL MUR MEaSUREs, PO.DAAC), doi:10.5067/GHGMR-4FJ04. Sources and licenses
Water temperature →Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 11:48 pm (local time).
Nearest buoy
This is a real measurement of the sea, not a forecast. Data from Centre for Studies on Risks Environment Mobility and Urban Planning - Technical directorate Risks waters and sea (Plouzane), via the E.U. Copernicus Marine Service. Generated using E.U. Copernicus Marine Service Information (doi:10.48670/moi-00036).
Diving in Crozon today
Diving and snorkeling today
Likely visibility: poor- Slack water around high tide (6:17 pm): little current from 6:00 pm to 6:40 pm
- 6.5 ft swell at 10 s from the west: strong surge on the bottom
- Almost no wind
- 0.2 mph current toward the east-southeast, weak (model)
- Daylight
- Slack water today: low tide 11:55 pm (11:40 pm–12:10 am), high tide 5:53 am (5:30–6:10 am), low tide 12:19 pm (12:00–12:40 pm) and high tide 6:17 pm (6:00–6:40 pm)
- Likely visibility: poor. Swell (up to 9.8 ft at 9 s) over the last few days has stirred up the water. Based on the last 24 hours of data.
- Water at 57.6 °F: a 7 mm wetsuit, with hood and booties.
- Snorkeling: better not, with these waves, wind or current.
- Night dive: dark from 6:38 pm. Waning gibbous (93%), rising at 7:05 pm: a bright night.
Your diving day at a glance
The best window, 5:30 pm to 6:10 pm, combines slack water at high tide, light wind and weak current, though with a big swell. Also worth a look from 11:40 am to 12:50 pm, with slack water at low tide, light wind, weak current and the sun high, though with a big swell.
Slack water comes from the tide: in inlets, channels and between islands the water can keep running for an hour or two after. Ask the local dive shop.
Never dive alone and check with the local dive shop: this rating is a guide, not a substitute for a professional.
Dive sites, wrecks and dive shops nearby
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Centre de Plongée I.S.A. 1.7 mi
- Csam Section Plongée 8.5 mi
- Club Subaquatique de l'Iroise 8.5 mi
- G.M.A.P. 9.3 mi
- Peniche 4.6 mi
- Furieux 5.7 mi
- Roca 6.4 mi
- Wreck 3.1 mi
- Wreck 3.6 mi
- Centre de plongée ISA 1.7 mi
- Centre Activités Plongée 5.1 mi
- ACDC Plongée Plougastel 7.1 mi
Within 12 mi. Some may be missing or closed; marine reserves usually need a permit. Open the map on OpenStreetMap · Missing one? Add it to OpenStreetMap
Wreck and reef positions are approximate and not for navigation; a wreck’s depth runs from the top of the hull to the seabed.
Sites: © OpenStreetMap contributors (ODbL). Wrecks: EMODnet Human Activities (AND-International), from UK Hydrographic Office data, CC BY 4.0. Contains public sector information licensed under the Open Government Licence v3.0.
Weather in Crozon
Now in Crozon
- Low / high
- 49 / 60 °F
- Rain
- 0.00 in · 0%
- Clouds
- 91%
- Humidity
- 91%
- Dew pointDew point
- 47 °F
- Visibility
- 13 mi
- UV indexUV
- 0 · low
- Air qualityAir
- Fair · 40
- Saharan dust
- No
- Pollen
- None
Pressure and fishing
- ↗ RisingRising Anglers say fish bite less for a while
- → SteadySteady · now Anglers expect normal activity
- ↘ FallingFalling Anglers say fish feed more before the change
Steady now (−0.02 inHg in 3 hours). Over the next 48 hours: −0.04 inHg. Steady pressure: anglers expect normal activity. Fast changes, either way, tend to affect fishing.
Today, hour by hourHour by hour
Bars: mean wind. Dashed line: gusts. Arrows point where the wind blows to.
| Time | 12:00 am | 3:00 am | 6:00 am | 9:00 am | 12:00 pm | 3:00 pm | 6:00 pm | 9:00 pm |
|---|---|---|---|---|---|---|---|---|
| Sky | Partly cloudy | Partly cloudy | Partly cloudy | Light showers | Overcast | Overcast | Overcast | Overcast |
| Temperature | 51° | 50° | 50° | 51° | 59° | 59° | 55° | 49° |
| Wind (mph) | 6 WNW | 4 W | 4 SW | 5 SW | 7 SW | 7 SW | 3 SSW | 3 ESE |
| Gusts | 9 | 7 | 9 | 8 | 14 | 15 | 7 | 3 |
| Waves | 9.0 ft | 8.9 ft | 8.5 ft | 8.2 ft | 7.7 ft | 7.2 ft | 6.6 ft | 5.9 ft |
| Rain | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in |
- 12:00 am 49° 5 SE 5.4 ft
- 3:00 am 47° 4 E 4.9 ft
- 6:00 am 45° 5 E 4.5 ft
- 9:00 am 46° 6 ESE 4.1 ft
- 12:00 pm 56° 9 SE 3.8 ft
- 3:00 pm 58° 10 SE 3.5 ft
- 6:00 pm 55° 6 ESE 3.1 ft
- 9:00 pm 50° 5 ENE 2.9 ft
Next 14 daysComing days
| Day | Sky | Low / high | Max wind | Max wave | High tides |
|---|---|---|---|---|---|
| Today · 28 | 49 / 60 °F | 8 mph SW | 9.1 ft | 5:53 am · 6:17 pm | |
| Thu 29 | 44 / 58 °F | 11 mph ESE | 5.4 ft | 6:35 am · 7:01 pm | |
| Fri 30 | 43 / 60 °F | 9 mph E | 3.9 ft | 7:19 am · 7:48 pm | |
| Sat 31 | 46 / 60 °F | 8 mph ENE | 4.3 ft | 8:09 am · 8:44 pm | |
| Sun 1 | 49 / 58 °F | 11 mph NE | 3.7 ft | 9:10 am · 9:56 pm | |
| Mon 2 | 50 / 59 °F | 13 mph NE | 2.8 ft | 10:28 am · 11:26 pm | |
| Tue 3 | 51 / 57 °F | 14 mph NE | 1.9 ft | 11:59 am | |
| Wed 4 | 47 / 54 °F | 14 mph ENE | 3.1 ft | 12:50 am · 1:15 pm | |
| Thu 5 | 44 / 52 °F | 12 mph ENE | 2.9 ft | 1:51 am · 2:12 pm | |
| Fri 6 | 46 / 54 °F | 11 mph E | 1.6 ft | 2:38 am · 2:58 pm | |
| Sat 7 | 49 / 58 °F | 13 mph SE | 2.6 ft | 3:19 am · 3:38 pm | |
| Sun 8 | 55 / 58 °F | 11 mph SE | 3.2 ft | 3:57 am · 4:16 pm | |
| Mon 9 | 57 / 60 °F | 12 mph S | 3.7 ft | 4:34 am · 4:52 pm | |
| Tue 10 | 55 / 58 °F | 12 mph SSW | 3.9 ft | 5:09 am · 5:27 pm |
- Thu 29 Overcast 44° / 58° 5.4 ft
- Fri 30 Overcast 43° / 60° 3.9 ft
- Sat 31 Partly cloudy 46° / 60° 4.3 ft
- Sun 1 Overcast 49° / 58° 3.7 ft
- Mon 2 Overcast 50° / 59° 2.8 ft
- Tue 3 Overcast 51° / 57° 1.9 ft
- Wed 4 Clear sky 47° / 54° 3.1 ft
Each day comes from the best model covering this spot: regional ones first (HRRR and NBM in the U.S., AROME, ICON-EU), then ECMWF; day 16, NOAA GFS. Waves: Météo-France up to day 10, then ECMWF WAM, coarser and further offshore. High tides: our own tide calculation.
- The models They agree · high confidence for the next few days. See the models →
- Outlook Next few weeks, compared with normal: normal temperatures, normal rain and a slightly cooler sea. See the outlook →
- Normal Today, normal highs for late October (58 °F). Climate by month →
Forecast from Open-Meteo (CC BY 4.0) with models from ECMWF, NOAA, Météo-France, DWD, Copernicus Marine and CAMS. Updated at 11:48 pm (local time).
The sun in Crozon
Sunrise and sunset
- First light 6:48 am
- Full dark 7:15 pm
- Civil dawn 7:25 am
- Civil dusk 6:38 pm
- Solar noon 1:02 pm (29° high)
- Daylight 10 h 9 min (−3 min)
- Evening golden hour 5:21 pm
- Full dark 7:15 pm
Golden hour and the day-night map
Today the sun is 92,359,556 mi away and looks 32′ 11″ across.
The moon in Crozon
Moon phase and position
Today the moon is 226,461 mi away and looks 32′ 47″ across.
Solunar periods
Today's activity: high- 1:41–3:41 am Major · the moon passes overhead · high activity
- 2:12–4:12 pm Major · the moon passes underfoot · high activity
- 10:44–11:44 am Minor · moonset · medium activity
- 6:35–7:35 pm Minor · moonrise · medium activity
According to solunar theory, fish feed more when the moon passes overhead or underfoot (major periods, about 2 h) and when it rises or sets (minor periods, 1 h). It works best around new and full moon.
Upcoming moon phases
2026 moon calendar →- Last quarter Sun, Nov 1 · 9:29 pmNov 1 in 4 days
- New moon Mon, Nov 9 · 8:03 amNov 9 in 12 days
- First quarter Tue, Nov 17 · 12:48 pmNov 17 in 20 days
- Full moon Tue, Nov 24 · 3:54 pmNov 24 in 27 days
Perigee on October 28, 226,426 mi away, coinciding with the spring tides from October 26 to 28: they will be stronger than usual.
Where to fish in Crozon
Piers, ramps and tackle shops nearby
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Ponton A 1.5 mi
- Ponton B 1.5 mi
- Ponton C 1.5 mi
- Ponton D 1.6 mi
- Ponton E 1.6 mi
- Ponton visiteur 1.6 mi
- Ponton F 1.6 mi
- Boat ramp 0.7 mi
- Boat ramp 1.6 mi
- Boat ramp 1.7 mi
- Port du Fret 2.8 mi
- Port de Pêche 5.0 mi
Within 9.3 mi. A spot may be missing or closed. Open the map on OpenStreetMap · Missing one? Add it to OpenStreetMap
Spots: © OpenStreetMap contributors (ODbL) and Overture Maps.
Water depth
Very shallowVery shallow and flat: even 1 mi from shore the water is less than 16 ft deep.
From the shoreline (0.85 mi from Crozon) out to sea, heading southwest.
How far from shore
- 16 ft deepnot within 1 mi
- 33 ft deepnot within 1 mi
- 66 ft deepnot within 1 mi
- 164 ft deepnot within 1 mi
For fishing, swimming and diving
- Shore fishing. Very shallow: the water doesn't reach 16 ft within 1 mi. Cast far from the beach, ideally around high tide.
- Swimming. A very gentle way in with plenty of shallow water, good for kids. At low tide the water can be far out.
- Diving. Shallow: the water doesn't reach 33 ft within 1 mi. For deeper dives, take a boat farther out.
Inside bays, estuaries and harbors the bottom changes a lot from spot to spot (channels and shoals): use this only as a rough guide. There is land ahead (an island, a headland or the far shore) 1 mi out. The profile is turned slightly from the coast so it does not run into an island or a headland. Where the bottom comes up to the surface there are shoals, rocks or an islet next to the profile.
Source: EMODnet Bathymetry DTM 2024 (CC BY 4.0), cells of about 380 ft; depth at the lowest astronomical tide. For reference only: not for navigation or anchoring.
Nearest lighthouse
Phare de Morgat 1.9 mi south
- Light
- Light that goes dark 4 times every 12 s; white, red or green depending on where you see it from · Oc(4) WRG 12s
- Range
- 15 nautical miles (17 mi)
- Light height
- 253 ft above sea level
- Tower height
- 49 ft
- Built
- 1914
Other lighthouses nearby: ancien phare de Camaret-sur-Mer (5.2 mi northwest).
Light details: NGA List of Lights (USA); the rest from Wikidata. For reference only: not for navigation. Wikidata · Sources and licenses
Tides near CrozonTides nearby
- Lanvéoc3.1 mi
- Camaret-sur-Mer5.3 mi
- Roscanvel5.5 mi
- Telgruc-sur-Mer6.2 mi
- Recouvrance9.5 mi
- Brest9.9 mi
- Logonna-Daoulas10 mi
- Plougastel-Daoulas10 mi
- Beuzec-Cap-Sizun12 mi
- Le Relecq-Kerhuon12 mi
Crozon at a glance
- Town or city of about 8,123 people. Coordinates: 48.246° N, 4.490° W.
- It is 9.9 mi south of Brest, the main place in Brittany. The sun rises at the same time and sets at the same time than in Brest.
- The nearest tide station, Brest, is 9.4 mi to the north.
- Its coast faces west.
- Beaches and harbors nearby: Centre Nautique de Crozon Morgat (1.6 mi), Trez-Rouz (4.6 mi), La Mort Anglaise (4.6 mi).
Questions about CrozonQuestions
What time is high tide today in Crozon?
Today in Crozon there are high tides at 5:53 am (22.6 ft) and 6:17 pm (22.4 ft) and low tide at 12:19 pm. Tide coefficient 99.
What time is sunset today in Crozon?
At 6:06 pm. There is light until the end of civil twilight, at 6:38 pm.
What time is sunrise tomorrow in Crozon?
At 7:59 am. First light comes at 6:50 am.
What phase is the moon today?
Waning gibbous, 93% illuminated. New moon on Mon, Nov 9 · 8:03 am.
When are the next spring tides?
From October 26 to 28, together with the lunar perigee: they will be stronger than usual.
What are today's solunar periods?
Major 1:41–3:41 am, Minor 10:44–11:44 am, Major 2:12–4:12 pm, Minor 6:35–7:35 pm. Today's activity is high.
What's the weather like today in Crozon?
Light showers, from 49 °F to 60 °F, with a light breeze from the southeast (5 mph) and a 0% chance of rain.
How is the sea today in Crozon?
Moderate (Douglas 4): 5.4 ft waves with a period of 10.8 s from the west. The water is 57.6 °F.
When is the best time to visit Crozon?
The best time to visit Crozon is from July to August: highs of 68 °F, about 7 rainy days a month and 7 hours of sunshine a day.
Can I use this data for navigation?
No. These are predictions for fishing and leisure; for navigation, use the official publications.
Where this data comes from
Tide: Brest station, with constants from TICON-4 (Hart-Davis, Dettmering and Seitz, 2025, SEANOE), licensed CC BY 4.0, via Slackwater database (changes). Sun and moon: our own calculation with astronomy-engine. Places: GeoNames (CC BY 4.0). Coastline: © OpenStreetMap contributors (ODbL).