Schiermonnikoog tides today
- Tide now 2.1 ft ↑ rising · high 12:12 pm (9.7 ft)
- Best time to fish 11:50 am–12:50 pm average day · 6/10
- Beach day Not today Not a beach day · 1/10
- Waves · water 1.6 ft · 55 °F smooth · 4.5 s from the west-northwest
- Wind · air 7 mph · 54 °F from the WSW, gusts 12 · overcast
- Surf today 0.8–1.2 ft Poor day · 0/10 · 2:00–5:45 pm
- Sun 7:29 am–5:09 pm 9 h 40 min of daylight
- Moon 85% · 6:40 pm waning gibbous · rises at 6:40 pm
Today in Schiermonnikoog there is high tide at 12:12 pm (9.7 ft) and low tides at 6:01 am and 6:22 pm. Tide coefficient 77. Right now the tide is rising toward the high tide at 12:12 pm. The sun rises at 7:29 am and sets at 5:09 pm: 9 h 40 min of daylight. The moon is 85% illuminated (waning gibbous) and rises at 6:40 pm. Major solunar periods run from 2:00 am to 4:00 am and from 2:32 pm to 4:32 pm. The next spring tides arrive from November 9 to 11. The sea is smooth, with 1.6 ft waves. There's a light breeze from the west-southwest (7 mph). Overcast, 54 °F.
Fishing in Schiermonnikoog today
Best time to fish
Solunar activity today: medium- High tide at 12:12 pm, coefficient 77
- Minor period 11:53 am–12:53 pm (moonset)
- Rising pressure (+0.15 inHg in 24 h), light cross-shore wind (6 mph) and calm sea (1.3 ft waves)
- Waning gibbous: a bit more activity than at the quarters
- Highest tide coefficient today: 77 (average tides)
- A major period lines up with sunset
Your day at a glance
The best window, 11:50 am to 12:50 pm, combines the 12:12 pm high tide and moonset, though with rising pressure. Also worth a try from 5:20 pm to 7:10 pm, with the 6:22 pm low tide, moonrise and sunset, though with rising pressure. Also worth a try from 5:00 am to 7:00 am, with the 6:01 am low tide, sunrise and some swell, though with rising pressure.
Species with the most records nearby: European plaice, whiting, common sole and European flounder. October is one of the months when these are seen most: European flounder. What you can catch
Beach day in Schiermonnikoog
Is it a beach day?
- Sun and clouds
- Cross-shore breeze (6 mph)
- Calm for swimming: 1.4 ft waves
- Feels like 55 °F: chilly for the beach
- Water at 55 °F (very cold)
- High tide at 12:12 pm
Today, hour by hour
- Swimming Calm · 1.4 ft
1.4 ft waves: calm for swimming. Low rip current risk. Always follow the lifeguard's flags.
- Water 55 °F
Very cold: ease in and keep swims short.
- Sun & sunscreen UV 1 · SPF 15
Max UV 1 (low): SPF 15 sunscreen.
- Wind 6 mph
Cross-shore breeze (6 mph).
- Tide & sand 6:22 pm
Low tide at 6:01 am and 6:22 pm: that's when there's the most sand. High tide at 12:12 pm.
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 Schiermonnikoog
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Westerstrand 0.9 mi · W
- Restrooms
- Noorderstrand 2.2 mi · NE
- Lifeguard
- Restrooms
Excellent water quality 2025 season, EEA
- Buitenrif-Oost 3.9 mi · W
- Oostrif 4.0 mi · W
- Oostelijke washover 4.1 mi · W
- Middenrif 4.4 mi · W
- Westelijke washover 4.6 mi · W
- Buitenrif-West 4.6 mi · W
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 authorities of the Netherlands.
Webcams near Schiermonnikoog
Webcams provided by windy.com — add a webcam
Tides in Schiermonnikoog
Today's high and low tides
- ▼ Low tide 6:01 am 1.8 ft
- ▲ Next high tide 12:12 pm 9.7 ft · coef. 77
- ▼ Low tide 6:22 pm 2.2 ft
↑ Rising The tide is rising. 5 h 40 min to high tide at 12:12 pm.
Tide coefficient 77 for the 12:12 pm high tide. Average coefficient. The water rises and falls 7.9 ft between the highest high and the lowest low: an average 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 October 10 (10.7 ft) and the lowest, on April 20 (0.7 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 9 to 11 (coefficient 86, 9.3 ft range). The smallest, from October 20 to 21 (coefficient 45, 4.9 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 | 7:29 am · 5:09 pm | Low tide 6:01 am · 1.8 ft | High tide 12:12 pm · 9.7 ft | Low tide 6:22 pm · 2.2 ft | — | Coef. 77 | 85% | Major periods 2:00 am · 2:32 pm | Medium |
| Fri 30 | 7:30 am · 5:07 pm | High tide 12:22 am · 9.7 ft | Low tide 6:45 am · 1.9 ft | High tide 12:58 pm · 9.4 ft | Low tide 7:03 pm · 2.4 ft | Coef. 76 | 76% | Major periods 3:04 am · 3:36 pm | Medium |
| Sat 31 | 7:32 am · 5:05 pm | High tide 12:55 am · 9.7 ft | Low tide 7:30 am · 2.0 ft | High tide 1:52 pm · 9.0 ft | Low tide 7:47 pm · 2.7 ft | Coef. 72 | 66% | Major periods 4:07 am · 4:37 pm | Medium |
| Sun 1 | 7:34 am · 5:03 pm | High tide 1:50 am · 9.6 ft | Low tide 8:21 am · 2.3 ft | High tide 2:55 pm · 8.6 ft | Low tide 8:35 pm · 3.1 ft | Coef. 66 | Last quarter | Major periods 5:06 am · 5:34 pm | Medium |
| Mon 2 | 7:36 am · 5:01 pm | High tide 2:59 am · 9.4 ft | Low tide 9:18 am · 2.6 ft | High tide 4:03 pm · 8.3 ft | Low tide 9:31 pm · 3.4 ft | Coef. 60 | 43% | Major periods 6:00 am · 6:25 pm | Medium |
| Tue 3 | 7:38 am · 4:59 pm | High tide 4:11 am · 9.4 ft | Low tide 10:29 am · 2.9 ft | High tide 5:16 pm · 8.2 ft | Low tide 10:42 pm · 3.6 ft | Coef. 55 | 33% | Major periods 6:50 am · 7:13 pm | Medium |
| Wed 4 | 7:40 am · 4:57 pm | High tide 5:27 am · 9.5 ft | Low tide 11:54 am · 2.9 ft | High tide 6:30 pm · 8.5 ft | — | Coef. 60 | 23% | Major periods 7:36 am · 7:58 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
Tides from the Schiermonnikoog station (TICON-4), 2.2 mi from Schiermonnikoog. Times and heights are its predictions.
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 Schiermonnikoog
Sea stateSea state: smooth
The waves you may find
- Most commonMost common0.8 ft
- Significant1.6 ft
- Highest expectedHighest3.3 ft
One wave in seven is higher than the significant height, and about 3 times a day one reaches 3.3 ft. Before heading out, expect waves of up to 3.3 ft.
Wind on the coast and offshore
Cross-shore wind. The coast faces north and the wind blows along the shore: drift and current run parallel to the beach.
Wave height, next 7 daysWaves, next 7 days
Waves build over the next few days. The biggest waves arrive on Monday 2: 5.1 ft with a period of 6 s, from the north (moderate).
Water temperature
Water temperature →Water temperature changes how fish behave: in very cold or very warm water they feed less. The water is steady these days, with no sudden changes.
Water warmer than normal for late October (+1.2 °F).
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 6:32 am (local time).
Nearest buoy
This is a real measurement of the sea, not a forecast. Data from Rijkswaterstaat Water, Traffic and Environment, via the E.U. Copernicus Marine Service. Generated using E.U. Copernicus Marine Service Information (doi:10.48670/moi-00036).
Surf in Schiermonnikoog today
Surf today
Poor- 0.8–1.2 ft surf at the shore, small: good for learning or a longboard
- 0.8 ft swell at 6 s from the northwest, short: weak, messy waves
- Light onshore wind (5 mph): a bit of chop
- Falling tide (low tide at 6:22 pm)
- Light: First light 6:52 am · sunrise 7:29 am · sunset 5:09 pm · last light 5:45 pm
- Tide: low 6:01 am (1.8 ft), high 12:12 pm (9.7 ft) and low 6:22 pm (2.2 ft). Every break has its own tide: some work at low tide and others at high tide. The tide doesn’t change the score here.
- Water at 54.5 °F: a 5/4 fullsuit with booties (and a hood if it’s windy).
- Energy: 5 kJ · Low power
Today’s surf at a glance
The best window is 2:00 pm to 5:45 pm, though with small waves and a short-period swell.
An estimate for this stretch of coast, not for a specific break: every beach or reef works its own way (its tide, bottom and angle). Check it when you get there.
Follow the flags and the lifeguards, and don’t paddle out if the surf is above your level: this score is a guide, not a substitute for what you see when you get there.
Diving in Schiermonnikoog today
Diving and snorkeling today
Likely visibility: good- Slack water around high tide (12:12 pm): little current from 10:50 am to 1:00 pm
- 1.2 ft swell at 3 s from the west-northwest: barely any surge
- Light cross-shore wind (6 mph)
- 0.1 mph current toward the east, weak (model)
- Sun high: more light underwater
- Slack water today: high tide 11:51 pm (10:30 pm–12:30 am), low tide 6:01 am (5:46–6:16 am), high tide 12:12 pm (10:50 am–1:00 pm), low tide 6:22 pm (6:07–6:37 pm) and high tide 12:22 am (11:00 pm–1:10 am)
- Likely visibility: good. The sea has been calm and there's been little rain. Based on the last 24 hours of data.
- Water at 54.5 °F: a 7 mm semi-dry suit, with hood, gloves and booties.
- Snorkeling: good, calm sea and light wind.
- Night dive: dark from 5:45 pm. Waning gibbous (85%), rising at 6:40 pm: a bright night.
Your diving day at a glance
The best window, 10:30 am to 1:00 pm, combines slack water at high 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
- Vivan 2.0 mi
- Krimhild 2.5 mi
- Inga 2.8 mi
- Janne Malene 3.5 mi
- Kai 4.2 mi
- Wreck 3.7 mi
- Wreck 3.8 mi
- Wreck 3.8 mi
- Brakzandstergat 3.4 mi
- Het Rif 4.6 mi
- Kwelder Schiermonnikoog 4.8 mi
- Peazemerlannen 5.3 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 Schiermonnikoog
Now in Schiermonnikoog
- Low / high
- 53 / 56 °F
- Rain
- 0.00 in · 47%
- Clouds
- 98%
- Humidity
- 94%
- Dew pointDew point
- 52 °F
- Visibility
- 7.0 mi
- UV indexUV
- 0 · low
- Air qualityAir
- Fair · 24
- Saharan dust
- No
- Pollen
- None
Pressure and fishing
- ↗ RisingRising · now Anglers say fish bite less for a while
- → SteadySteady Anglers expect normal activity
- ↘ FallingFalling Anglers say fish feed more before the change
Rising now (+0.04 inHg in 3 hours). Over the next 48 hours: +0.21 inHg. Rising pressure: anglers say fish bite less for a while. 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 | Partly cloudy | Partly cloudy | Mainly clear | Partly cloudy | Partly cloudy |
| Temperature | 54° | 54° | 54° | 54° | 56° | 56° | 55° | 54° |
| Wind (mph) | 10 SW | 9 SW | 8 WSW | 5 WSW | 6 WSW | 5 W | 3 WNW | 1 SSW |
| Gusts | 16 | 14 | 13 | 9 | 9 | 9 | 6 | 2 |
| Waves | 2.4 ft | 2.0 ft | 1.6 ft | 1.4 ft | 1.3 ft | 1.2 ft | 1.1 ft | 1.1 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 |
- 6:00 am 54° 8 WSW 1.6 ft
- 9:00 am 54° 5 WSW 1.4 ft
- 12:00 pm 56° 6 WSW 1.3 ft
- 3:00 pm 56° 5 W 1.2 ft
- 6:00 pm 55° 3 WNW 1.1 ft
- 9:00 pm 54° 1 SSW 1.1 ft
- 12:00 am 53° 2 SW 1.0 ft
- 3:00 am 52° 3 S 1.0 ft
Next 14 daysComing days
| Day | Sky | Low / high | Max wind | Max wave | High tides |
|---|---|---|---|---|---|
| Today · 29 | 53 / 56 °F | 10 mph WSW | 2.4 ft | 12:12 pm | |
| Fri 30 | 48 / 53 °F | 6 mph SSE | 1.0 ft | 12:22 am · 12:58 pm | |
| Sat 31 | 49 / 55 °F | 6 mph SSW | 0.8 ft | 12:55 am · 1:52 pm | |
| Sun 1 | 54 / 55 °F | 12 mph NNW | 3.3 ft | 1:50 am · 2:55 pm | |
| Mon 2 | 52 / 54 °F | 24 mph N | 5.1 ft | 2:59 am · 4:03 pm | |
| Tue 3 | 46 / 52 °F | 23 mph NE | 4.3 ft | 4:11 am · 5:16 pm | |
| Wed 4 | 39 / 49 °F | 3 mph SSE | 2.6 ft | 5:27 am · 6:30 pm | |
| Thu 5 | 39 / 49 °F | 3 mph WSW | 1.6 ft | 6:42 am · 7:34 pm | |
| Fri 6 | 43 / 51 °F | 3 mph WNW | 1.6 ft | 7:46 am · 8:26 pm | |
| Sat 7 | 36 / 47 °F | 6 mph ESE | 1.0 ft | 8:38 am · 9:10 pm | |
| Sun 8 | 35 / 46 °F | 6 mph SSW | 0.9 ft | 9:23 am · 9:49 pm | |
| Mon 9 | 42 / 51 °F | 9 mph SSE | 1.0 ft | 10:02 am · 10:26 pm | |
| Tue 10 | 49 / 55 °F | 12 mph S | 1.3 ft | 10:38 am · 11:00 pm | |
| Wed 11 | 51 / 56 °F | 12 mph S | 1.2 ft | 11:13 am · 11:33 pm |
- Fri 30 Fog 48° / 53° 1.0 ft
- Sat 31 Fog 49° / 55° 0.8 ft
- Sun 1 Light rain 54° / 55° 3.3 ft
- Mon 2 Light rain 52° / 54° 5.1 ft
- Tue 3 Overcast 46° / 52° 4.3 ft
- Wed 4 Overcast 39° / 49° 2.6 ft
- Thu 5 Overcast 39° / 49° 1.6 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 Partly agree · medium confidence: unsure about wind on Sunday 1. See the models →
- Outlook Next few weeks, compared with normal: normal temperatures, normal rain and a slightly warmer sea. See the outlook →
- Normal Today, warmer than normal for late October (+3.9 °F; normal high: 52 °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 6:32 am (local time).
The sun in Schiermonnikoog
Sunrise and sunset
- First light 6:11 am
- Full dark 6:26 pm
- Civil dawn 6:52 am
- Civil dusk 5:45 pm
- Solar noon 12:19 pm (23° high)
- Daylight 9 h 40 min (−4 min)
- Evening golden hour 4:17 pm
- Full dark 6:26 pm
Golden hour and the day-night map
Today the sun is 92,335,963 mi away and looks 32′ 11″ across.
The moon in Schiermonnikoog
Moon phase and position
Today the moon is 226,618 mi away and looks 32′ 45″ across.
Solunar periods
Today's activity: medium- 2:00–4:00 am Major · the moon passes overhead · high activity
- 2:32–4:32 pm Major · the moon passes underfoot · high activity
- 11:53 am–12:53 pm Minor · moonset · medium activity
- 6:10–7:10 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 Schiermonnikoog
Piers, ramps and tackle shops nearby
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Jetty 0.9 mi
- Jetty 1.1 mi
- Jetty 1.6 mi
- Jetty 2.0 mi
- Jetty 4.9 mi
- Jetty 5.0 mi
- Boat ramp 5.8 mi
- Boat ramp 6.3 mi
- Boat ramp 7.2 mi
- Jachthaven Schiermonnikoog 1.0 mi
- Noordergat 5.6 mi
- Gulf 5.6 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: 3.1 mi from shore the water is still only about 31 ft deep.
From the shoreline (1.1 mi from Schiermonnikoog) out to sea, heading north.
How far from shore
- 16 ft deep2 mi
- 33 ft deepnot within 3.1 mi
- 66 ft deepnot within 3.1 mi
- 164 ft deepnot within 3.1 mi
For fishing, swimming and diving
- Shore fishing. Shallow, gradual bottom (16 ft at 2 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 3.1 mi. For deeper dives, take a boat farther out.
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
North Tower 0.5 mi northwest
- Light
- 4 white flashes every 20 s · Fl(4) W 20s
- Range
- 28 nautical miles (32 mi)
- Light height
- 144 ft above sea level
- Tower height
- 121 ft
- Built
- 1854
Other lighthouses nearby: Zuidertoren (0.6 mi east).
Light details: NGA List of Lights (USA); the rest from Wikidata. For reference only: not for navigation. Wikipedia · Wikidata · Sources and licenses
Tides near SchiermonnikoogTides nearby
- Lauwersoog5.8 mi
- Paesens6.1 mi
- Moddergat6.1 mi
- Wierum7.8 mi
- Ternaard10 mi
- Holwert13 mi
- Buren15 mi
- Nes16 mi
- Ballum19 mi
- Hollum21 mi
Schiermonnikoog at a glance
- Town or city of about 936 people. Coordinates: 53.480° N, 6.152° E.
- It is 39 mi east of West-Terschelling, the main place in Friesland. The sun rises 3 min earlier and sets 4 min earlier than in West-Terschelling.
- The nearest tide station, Schiermonnikoog, is 2.2 mi to the east.
- Its coast faces north.
- Beaches and harbors nearby: Jachthaven Schiermonnikoog (0.9 mi), Het Rif (1.7 mi), Oosterstrand (4.4 mi).
Questions about SchiermonnikoogQuestions
What time is high tide today in Schiermonnikoog?
Today in Schiermonnikoog there is high tide at 12:12 pm (9.7 ft) and low tides at 6:01 am and 6:22 pm. Tide coefficient 77.
What time is sunset today in Schiermonnikoog?
At 5:09 pm. There is light until the end of civil twilight, at 5:45 pm.
What time is sunrise tomorrow in Schiermonnikoog?
At 7:30 am. First light comes at 6:13 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 2:00–4:00 am, Minor 11:53 am–12:53 pm, Major 2:32–4:32 pm, Minor 6:10–7:10 pm. Today's activity is medium.
What's the weather like today in Schiermonnikoog?
Overcast, from 53 °F to 56 °F, with a light breeze from the west-southwest (7 mph) and a 47% chance of rain.
How is the sea today in Schiermonnikoog?
Smooth (Douglas 2): 1.6 ft waves with a period of 4.5 s from the west-northwest. The water is 54.5 °F.
When is the best time to visit Schiermonnikoog?
The best time to visit Schiermonnikoog is from July to August: highs of 70 °F, about 11 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: Schiermonnikoog 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).