Saint-Père-Marc-en-Poulet tides today
- Tide now 5.7 ft ↓ falling · low 3:25 am (5.6 ft)
- Best time to fish 3:10–4:50 pm good day · 7/10
- Beach day Not today Not a beach day · 0/10
- Waves · water 1.4 ft · 58 °F smooth · 9.9 s from the west-northwest
- Wind · air 2 mph · 43 °F from the S, gusts 3 · overcast
- Sun 7:49 am–5:53 pm 10 h 4 min of daylight
- Moon 85% · 7:50 pm waning gibbous · rises at 7:50 pm
- Best time to dive 8:30–9:20 am great day · 10/10
Today in Saint-Père-Marc-en-Poulet there are high tides at 8:48 am (40.4 ft) and 9:12 pm (39.0 ft) and low tides at 3:25 am and 3:49 pm. Tide coefficient 93. Right now the tide is falling toward the low tide at 3:25 am. The sun rises at 7:49 am and sets at 5:53 pm: 10 h 4 min of daylight. The moon is 85% illuminated (waning gibbous) and rises at 7:50 pm. Major solunar periods run from 2:33 am to 4:33 am and from 3:06 pm to 5:06 pm. The next spring tides arrive from November 9 to 11. The sea is smooth, with 1.4 ft waves. There's a light air from the south (2 mph). Overcast, 43 °F.
Fishing in Saint-Père-Marc-en-Poulet today
Best time to fish
Solunar activity today: medium- Low tide at 3:49 pm
- Major period 3:06–5:06 pm
- Steady pressure (30.30 inHg), light offshore wind (10 mph) and calm sea (1.3 ft waves)
- Waning gibbous: a bit more activity than at the quarters
- Highest tide coefficient today: 93 (spring tides)
Your day at a glance
The best window, 3:10 pm to 4:50 pm, combines the 3:49 pm low tide and a major period. Also good from 7:50 am to 8:30 am, with the 8:48 am high tide and sunrise. Also good from 2:30 am to 4:30 am, with the 3:25 am low tide and a major period.
Species with the most records nearby: ballan wrasse, European flounder, small-spotted catshark and common cuttlefish. October is one of the months when these are seen most: European flounder. What you can catch
Beach day in Saint-Père-Marc-en-Poulet
Is it a beach day?
- Calm for swimming: 1.3 ft waves
- Low tide at 3:49 pm: more sand
- Cloudy (81% cloud cover)
- Feels like 54 °F: chilly for the beach
- Light offshore wind (10 mph): it blows floats and inflatables out to sea
- Water at 58 °F (very cold)
Today, hour by hour
- Swimming Calm · 1.3 ft
1.3 ft waves: calm for swimming. Low rip current risk. Always follow the lifeguard's flags.
- Water 58 °F
Very cold: ease in and keep swims short.
- Sun & sunscreen UV 2 · SPF 15
Max UV 2 (low): SPF 15 sunscreen.
- Wind 10 mph
Offshore breeze (10 mph). Watch floats and inflatables: offshore wind carries them out to sea.
- Tide & sand 3:25 am
Low tide at 3:25 am and 3:49 pm: that's when there's the most sand. High tide at 8:48 am and 9:12 pm. Coefficient 93 (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 Saint-Père-Marc-en-Poulet
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Plage du Vallion 2.5 mi · W
- Restrooms
- Parking
Excellent water quality 2025 season, EEA
- Plage de St-Suliac 2.7 mi · SW
- Restrooms
- Parking
- Plage de Vigneux 3.6 mi · SW
- Parking
Good water quality 2025 season, EEA
- Grève de Garel 3.6 mi · W
- Restrooms
Excellent water quality 2025 season, EEA
- Plage de la Passagère 4.0 mi · W
- Parking
- Plage du Rosais 4.8 mi · NW
- Parking
- Plage des Bas-Sablons 5.6 mi · NW
- Lifeguard
- Restrooms
- Parking
Good water quality 2025 season, EEA
- Plage de La Hoguette 6.2 mi · NW
- Restrooms
- Parking
Good water quality 2025 season, EEA
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 Saint-Père-Marc-en-Poulet
Webcams provided by windy.com — add a webcam
Tides in Saint-Père-Marc-en-Poulet
Today's high and low tides
- ▼ Next low tide 3:25 am 5.6 ft
- ▲ High tide 8:48 am 40.4 ft · coef. 93
- ▼ Low tide 3:49 pm 5.9 ft
- ▲ High tide 9:12 pm 39.0 ft · coef. 89
↓ Falling The tide is falling. 18 min to low tide at 3:25 am.
Tide coefficient 93 for the 8:48 am high tide and 89 for the 9:12 pm high tide. Spring tides. The water rises and falls 34.8 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 (41.8 ft) and the lowest, on March 20 (2.4 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 100, 36.7 ft range). The smallest, on October 20 (coefficient 26, 9.7 ft).
Tide and solunar table · this week
| Day | Sun | Tide 1 | Tide 2 | Tide 3 | Tide 4 | Coef. | Moon | Major periods | Activity |
|---|---|---|---|---|---|---|---|---|---|
| Today, Thu 29 | 7:49 am · 5:53 pm | Low tide 3:25 am · 5.6 ft | High tide 8:48 am · 40.4 ft | Low tide 3:49 pm · 5.9 ft | High tide 9:12 pm · 39.0 ft | Coef. 93 | 85% | Major periods 2:33 am · 3:06 pm | Medium |
| Fri 30 | 7:51 am · 5:51 pm | Low tide 4:09 am · 7.4 ft | High tide 9:29 am · 38.6 ft | Low tide 4:35 pm · 7.8 ft | High tide 9:56 pm · 36.6 ft | Coef. 84 | 76% | Major periods 3:38 am · 4:10 pm | Medium |
| Sat 31 | 7:52 am · 5:50 pm | Low tide 4:55 am · 9.8 ft | High tide 10:14 am · 36.2 ft | Low tide 5:24 pm · 10.1 ft | High tide 10:45 pm · 33.8 ft | Coef. 71 | 66% | Major periods 4:41 am · 5:11 pm | Medium |
| Sun 1 | 7:54 am · 5:48 pm | Low tide 5:47 am · 12.3 ft | High tide 11:08 am · 33.4 ft | Low tide 6:24 pm · 12.3 ft | High tide 11:50 pm · 31.1 ft | Coef. 58 | Last quarter | Major periods 5:40 am · 6:07 pm | Medium |
| Mon 2 | 7:55 am · 5:46 pm | Low tide 6:53 am · 14.2 ft | High tide 12:23 pm · 31.1 ft | Low tide 7:37 pm · 13.5 ft | — | Coef. 47 | 43% | Major periods 6:34 am · 6:59 pm | Medium |
| Tue 3 | 7:57 am · 5:45 pm | High tide 1:21 am · 29.7 ft | Low tide 8:14 am · 14.7 ft | High tide 1:58 pm · 30.7 ft | Low tide 8:59 pm · 13.2 ft | Coef. 46 | 33% | Major periods 7:23 am · 7:47 pm | Medium |
| Wed 4 | 7:59 am · 5:43 pm | High tide 2:53 am · 30.5 ft | Low tide 9:32 am · 13.4 ft | High tide 3:20 pm · 32.1 ft | Low tide 10:11 pm · 11.4 ft | Coef. 55 | 23% | Major periods 8:09 am · 8:32 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
Saint-Père-Marc-en-Poulet has no station of its own, so we use the tide at Saint-Malo (TICON-4), 6.0 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 Saint-Père-Marc-en-Poulet
Sea stateSea state: smooth
The waves you may find
- Most commonMost common0.7 ft
- Significant1.4 ft
- Highest expectedHighest2.9 ft
One wave in seven is higher than the significant height, and about 3 times a day one reaches 2.9 ft. Before heading out, expect waves of up to 2.9 ft.
Wind on the coast and offshore
Cross-shore wind. The coast faces west and the wind blows along the shore: drift and current run parallel to the beach.
Wave height, next 7 daysWaves, next 7 days
Waves stay much the same all week. The biggest waves arrive on Tuesday 3: 2.5 ft with a period of 4 s, from the northeast (slight).
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 Wednesday 4.
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 3:08 am (local time).
Diving in Saint-Père-Marc-en-Poulet today
Diving and snorkeling today
Likely visibility: good- Slack water around high tide (8:48 am): little current from 8:30 am to 9:10 am
- 1.2 ft swell at 8 s from the west-northwest: barely any surge
- Almost no wind
- 0.5 mph current toward the west-southwest, weak (model)
- Daylight
- Slack water today: low tide 3:25 am (3:00–3:50 am), high tide 8:48 am (8:30–9:10 am), low tide 3:49 pm (3:20–4:10 pm) and high tide 9:12 pm (8:57–9:30 pm)
- Likely visibility: good. Swell (up to 2.6 ft at 8 s) over the last few days has stirred up the water. Based on the last 24 hours of data.
- Water at 58.5 °F: a 7 mm wetsuit, with hood and booties.
- Snorkeling: good, calm sea and light wind.
- Night dive: dark from 6:26 pm. Waning gibbous (85%), rising at 7:50 pm: a bright night.
Your diving day at a glance
The best window, 8:30 am to 9:20 am, combines slack water at high tide, little swell, light wind and weak current. Also good from 2:30 pm to 3:50 pm, with slack water at low tide, little swell, light wind, weak current and the sun high.
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
- L'arlequin 7.9 mi
- Fatima 8.4 mi
- L'embarcadere 9.0 mi
- Elemore 9.1 mi
- Timac 9.4 mi
- Fetlar 9.5 mi
- Ro 21 9.8 mi
- Saint-Malo Plongée Émeraude 5.7 mi
- CSCE 5.7 mi
- Comarin 5.8 mi
- Nautilus Dive Center 6.0 mi
- Dinard Underwater Club 6.6 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 Saint-Père-Marc-en-Poulet
Now in Saint-Père-Marc-en-Poulet
- Low / high
- 42 / 59 °F
- Rain
- 0.00 in · 0%
- Clouds
- 100%
- Humidity
- 94%
- Dew pointDew point
- 41 °F
- Visibility
- 16 mi
- UV indexUV
- 0 · low
- Air qualityAir
- Fair · 31
- 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). It barely changes over the next 48 hours. 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 | Overcast | Overcast | Overcast | Overcast | Overcast | Mainly clear | Partly cloudy | Partly cloudy |
| Temperature | 45° | 42° | 43° | 43° | 55° | 59° | 55° | 47° |
| Wind (mph) | 3 SSW | 2 S | 2 SE | 1 SSW | 7 ESE | 10 ESE | 7 E | 5 E |
| Gusts | 5 | 3 | 3 | 1 | 13 | 17 | 15 | 8 |
| Waves | 1.6 ft | 1.4 ft | 1.3 ft | 1.3 ft | 1.2 ft | 1.3 ft | 1.2 ft | 1.0 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 |
- 3:00 am 42° 2 S 1.4 ft
- 6:00 am 43° 2 SE 1.3 ft
- 9:00 am 43° 1 SSW 1.3 ft
- 12:00 pm 55° 7 ESE 1.2 ft
- 3:00 pm 59° 10 ESE 1.3 ft
- 6:00 pm 55° 7 E 1.2 ft
- 9:00 pm 47° 5 E 1.0 ft
- 12:00 am 44° 5 ENE 1.0 ft
Next 14 daysComing days
| Day | Sky | Low / high | Max wind | Max wave | High tides |
|---|---|---|---|---|---|
| Today · 29 | 42 / 59 °F | 10 mph ESE | 1.6 ft | 8:48 am · 9:12 pm | |
| Fri 30 | 37 / 58 °F | 8 mph ENE | 1.2 ft | 9:29 am · 9:56 pm | |
| Sat 31 | 42 / 55 °F | 8 mph ENE | 1.4 ft | 10:14 am · 10:45 pm | |
| Sun 1 | 48 / 54 °F | 12 mph NE | 1.9 ft | 11:08 am · 11:50 pm | |
| Mon 2 | 49 / 56 °F | 16 mph NE | 2.3 ft | 12:23 pm | |
| Tue 3 | 48 / 55 °F | 13 mph NE | 2.5 ft | 1:21 am · 1:58 pm | |
| Wed 4 | 41 / 51 °F | 10 mph ENE | 2.1 ft | 2:53 am · 3:20 pm | |
| Thu 5 | 37 / 49 °F | 7 mph ENE | 1.8 ft | 4:01 am · 4:21 pm | |
| Fri 6 | 37 / 51 °F | 6 mph E | 1.3 ft | 4:53 am · 5:10 pm | |
| Sat 7 | 41 / 58 °F | 9 mph SSE | 1.8 ft | 5:36 am · 5:53 pm | |
| Sun 8 | 50 / 57 °F | 10 mph SSE | 1.3 ft | 6:16 am · 6:32 pm | |
| Mon 9 | 55 / 57 °F | 13 mph S | 1.5 ft | 6:52 am · 7:08 pm | |
| Tue 10 | 56 / 62 °F | 12 mph S | 1.4 ft | 7:26 am · 7:42 pm | |
| Wed 11 | 52 / 59 °F | 11 mph SW | 3.6 ft | 7:58 am · 8:14 pm |
- Fri 30 Partly cloudy 37° / 58° 1.2 ft
- Sat 31 Partly cloudy 42° / 55° 1.4 ft
- Sun 1 Overcast 48° / 54° 1.9 ft
- Mon 2 Overcast 49° / 56° 2.3 ft
- Tue 3 Light drizzle 48° / 55° 2.5 ft
- Wed 4 Clear sky 41° / 51° 2.1 ft
- Thu 5 Clear sky 37° / 49° 1.8 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 The next few weeks look normal for the time of year. See the outlook →
- Normal Today, normal highs for late October (59 °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 3:08 am (local time).
The sun in Saint-Père-Marc-en-Poulet
Sunrise and sunset
- First light 6:40 am
- Full dark 7:03 pm
- Civil dawn 7:16 am
- Civil dusk 6:26 pm
- Solar noon 12:51 pm (28° high)
- Daylight 10 h 4 min (−3 min)
- Evening golden hour 5:08 pm
- Full dark 7:03 pm
Golden hour and the day-night map
Today the sun is 92,335,421 mi away and looks 32′ 11″ across.
The moon in Saint-Père-Marc-en-Poulet
Moon phase and position
Today the moon is 226,618 mi away and looks 32′ 45″ across.
Solunar periods
Today's activity: medium- 2:33–4:33 am Major · the moon passes overhead · high activity
- 3:06–5:06 pm Major · the moon passes underfoot · high activity
- 11:51 am–12:51 pm Minor · moonset · medium activity
- 7:20–8:20 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 3 days
- New moon Mon, Nov 9 · 8:03 amNov 9 in 11 days
- First quarter Tue, Nov 17 · 12:48 pmNov 17 in 19 days
- Full moon Tue, Nov 24 · 3:54 pmNov 24 in 26 days
Next perigee (the moon at its closest to Earth): November 25, 223,281 mi away.
Where to fish in Saint-Père-Marc-en-Poulet
Piers, ramps and tackle shops nearby
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Cale de Mordreuc 5.7 mi
- Ponton de la Bourse 6.1 mi
- Digue de Rochebonne 6.0 mi
- La Gaule Malouine 4.7 mi
- Boat ramp 2.7 mi
- Boat ramp 2.8 mi
- Boat ramp 2.8 mi
- Cale du Bas Bout 3.8 mi
- Port de Plouër-sur-Rance 5.2 mi
- Port Saint-Père 5.7 mi
- Le Comptoir de la Mer 4.1 mi
- Fuel dock 6.5 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: 2 mi from shore the water is still only about 0 ft deep.
From the shoreline (1.7 mi from Saint-Père-Marc-en-Poulet) out to sea, heading west.
How far from shore
- 16 ft deep1.6 mi
- 33 ft deepnot within 2 mi
- 66 ft deepnot within 2 mi
- 164 ft deepnot within 2 mi
For fishing, swimming and diving
- Shore fishing. Shallow, gradual bottom (16 ft at 1.6 mi): cast far from the beach and fish the high tide, when there is more water close in.
- 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 2 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) 2 mi out. 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
La Balue lighthouse 4.5 mi northwest
- Light
- Steady green light · F G
- Range
- 22 nautical miles (25 mi)
- Light height
- 66 ft above sea level
Other lighthouses nearby: Bas-Sablons lighthouse (5.6 mi northwest).
Data from Wikidata. For reference only: not for navigation. Wikidata · Sources and licenses
Tides near Saint-Père-Marc-en-PouletTides nearby
- Châteauneuf-dIlle-et-Vilaine1.9 mi
- Saint-Jouan-des-Guérets2.4 mi
- Saint-Méloir-des-Ondes3.6 mi
- La Fresnais3.7 mi
- Le Minihic-sur-Rance4.1 mi
- La Richardais5.3 mi
- Pleudihen-sur-Rance5.3 mi
- Plouër-sur-Rance5.5 mi
- Saint-Malo5.6 mi
- Hirel5.7 mi
Saint-Père-Marc-en-Poulet at a glance
- Town or city of about 2,008 people. Coordinates: 48.588° N, 1.924° W.
- It is 118 mi east of Brest, the main place in Brittany. The sun rises 10 min earlier and sets 11 min earlier than in Brest.
- The nearest tide station, Saint-Malo, is 6.0 mi to the northwest.
- Its coast faces west.
Questions about Saint-Père-Marc-en-PouletQuestions
What time is high tide today in Saint-Père-Marc-en-Poulet?
Today in Saint-Père-Marc-en-Poulet there are high tides at 8:48 am (40.4 ft) and 9:12 pm (39.0 ft) and low tides at 3:25 am and 3:49 pm. Tide coefficient 93.
What time is sunset today in Saint-Père-Marc-en-Poulet?
At 5:53 pm. There is light until the end of civil twilight, at 6:26 pm.
What time is sunrise tomorrow in Saint-Père-Marc-en-Poulet?
At 7:51 am. First light comes at 6:41 am.
What phase is the moon today?
Waning gibbous, 85% illuminated. New moon on Mon, Nov 9 · 8:03 am.
When are the next spring tides?
From November 9 to 11.
What are today's solunar periods?
Major 2:33–4:33 am, Minor 11:51 am–12:51 pm, Major 3:06–5:06 pm, Minor 7:20–8:20 pm. Today's activity is medium.
What's the weather like today in Saint-Père-Marc-en-Poulet?
Overcast, from 42 °F to 59 °F, with a light air from the south (2 mph) and a 0% chance of rain.
How is the sea today in Saint-Père-Marc-en-Poulet?
Smooth (Douglas 2): 1.4 ft waves with a period of 9.9 s from the west-northwest. The water is 58.5 °F.
When is the best time to visit Saint-Père-Marc-en-Poulet?
The best time to visit Saint-Père-Marc-en-Poulet is from June to August: highs of 70 °F to 74 °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: Saint-Malo 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).