Traeth Crigyll today
- Beach day Not today Not a beach day · 0/10
- Tide now 5.2 ft ↓ falling · low 5:43 am (3.6 ft)
- Best time to fish 6:00–7:00 pm good day · 7/10
- Waves · water 3.1 ft · 56 °F slight · 5.7 s from the southwest
- Wind · air 9 mph · 56 °F from the SSW, gusts 15 · overcast
- Sun 7:11 am–4:52 pm 9 h 42 min of daylight
- Moon 85% · 6:27 pm waning gibbous · rises at 6:27 pm
- Best time to dive 10:40 am–12:30 pm good day · 7/10
Today in Traeth Crigyll there is high tide at 11:56 am (19.0 ft) and low tides at 5:43 am and 6:12 pm. Tide coefficient 88. Right now the tide is falling toward the low tide at 5:43 am. The sun rises at 7:11 am and sets at 4:52 pm: 9 h 42 min of daylight. The moon is 85% illuminated (waning gibbous) and rises at 6:27 pm. Major solunar periods run from 1:44 am to 3:44 am and from 2:17 pm to 4:17 pm. The next spring tides arrive from November 9 to 11. The sea is slight, with 3.1 ft waves. There's a gentle breeze from the south-southwest (9 mph). Overcast, 56 °F.
Beach day in Traeth Crigyll
Is it a beach day?
- Cloudy (94% cloud cover)
- Feels like 53 °F: chilly for the beach
- Moderate onshore wind (14 mph): choppy water
- Swim with care: 2.8 ft waves every 5 s
- Water at 56 °F (very cold)
- High tide at 11:56 am
Today, hour by hour
- Swimming Use care · 2.8 ft
2.8 ft waves every 5 s: swim with care and stay where you can stand. Low rip current risk. Always follow the lifeguard's flags.
- Water 56 °F
Very cold: ease in and keep swims short.
- Sun & sunscreen UV 1 · SPF 15
Max UV 1 (low): SPF 15 sunscreen.
- Wind 14 mph
Moderate onshore wind (14 mph).
- Tide & sand 5:43 am
Low tide at 5:43 am and 6:12 pm: that's when there's the most sand. High tide at 11:56 am.
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
About Traeth CrigyllThe beach
In Rhosneigr, 0.9 mi from the center. Tides, weather and sun in Rhosneigr →
- Restrooms
- Parking
Amenities from OpenStreetMap: some may be missing or out of date. See on OpenStreetMap · Fix on OpenStreetMap
Beaches near Traeth Crigyll
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Traeth Llydan 1.3 mi · NW
- Parking
Excellent water quality 2025 season, Natural Resources Wales
- Cymyran Beach 1.5 mi · NW
- Parking
- Porth Nobla 2.1 mi · SE
- Restrooms
- Parking
- Borth Wen Beach 2.3 mi · W
- Restrooms
- Parking
Good water quality 2025 season, Natural Resources Wales
- Porth Trecastell 2.5 mi · SE
- Parking
- Porth China 3.8 mi · SE
- Porth Castell 4.3 mi · NW
- Traeth y Gribin 4.9 mi · N
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).
UK bathing water quality: Natural Resources Wales. Contains public sector information licensed under the Open Government Licence v3.0. Full attribution.
Webcams near Traeth Crigyll
Webcams provided by windy.com — add a webcam
Fishing in Traeth Crigyll today
Best time to fish
Solunar activity today: medium- Low tide at 6:12 pm
- Minor period 5:57–6:57 pm (moonrise)
- Steady pressure (30.30 inHg), light cross-shore wind (8 mph) and some swell (3.0 ft waves) to stir the water
- Waning gibbous: a bit more activity than at the quarters
- Highest tide coefficient today: 88 (average tides)
- A major period lines up with sunset
Your day at a glance
The best window, 6:00 pm to 7:00 pm, combines the 6:12 pm low tide, moonrise and some swell. Also good from 2:30 pm to 4:20 pm, with a major period, sunset, a light onshore breeze and some swell. Also worth a try from 11:40 am to 12:40 pm, with the 11:56 am high tide, moonset and some swell, though with rising pressure and moderate wind.
Species with the most records nearby: European plaice, small-spotted catshark, thornback ray and common sole. October is one of the months when these are seen most: European plaice and common sole. What you can catch
Tides in Traeth Crigyll
Today's high and low tides
- ▼ Next low tide 5:43 am 3.6 ft
- ▲ High tide 11:56 am 19.0 ft · coef. 88
- ▼ Low tide 6:12 pm 3.4 ft
↓ Falling The tide is falling. 1 h 18 min to low tide at 5:43 am.
Tide coefficient 88 for the 11:56 am high tide. Average coefficient. The water rises and falls 15.5 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 December 26 (20.4 ft) and the lowest, on August 14 (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 26 to 28 (coefficient 93, 16.4 ft range). The smallest, from October 19 to 20 (coefficient 37, 7.2 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 | 7:11 am · 4:52 pm | Low tide 5:43 am · 3.6 ft | High tide 11:56 am · 19.0 ft | Low tide 6:12 pm · 3.4 ft | — | Coef. 88 | 85% | Major periods 1:44 am · 2:17 pm | Medium |
| Fri 30 | 7:13 am · 4:50 pm | High tide 12:25 am · 18.5 ft | Low tide 6:30 am · 4.3 ft | High tide 12:44 pm · 18.5 ft | Low tide 7:05 pm · 4.1 ft | Coef. 84 | 76% | Major periods 2:49 am · 3:21 pm | Medium |
| Sat 31 | 7:14 am · 4:48 pm | High tide 1:20 am · 17.6 ft | Low tide 7:22 am · 5.3 ft | High tide 1:40 pm · 17.9 ft | Low tide 8:05 pm · 4.9 ft | Coef. 75 | 65% | Major periods 3:52 am · 4:22 pm | Medium |
| Sun 1 | 7:16 am · 4:46 pm | High tide 2:23 am · 16.6 ft | Low tide 8:22 am · 6.3 ft | High tide 2:44 pm · 17.1 ft | Low tide 9:15 pm · 5.6 ft | Coef. 65 | Last quarter | Major periods 4:51 am · 5:18 pm | Medium |
| Mon 2 | 7:18 am · 4:44 pm | High tide 3:38 am · 15.7 ft | Low tide 9:33 am · 7.0 ft | High tide 4:00 pm · 16.5 ft | Low tide 10:33 pm · 5.8 ft | Coef. 56 | 43% | Major periods 5:44 am · 6:10 pm | Medium |
| Tue 3 | 7:20 am · 4:42 pm | High tide 5:03 am · 15.3 ft | Low tide 10:55 am · 7.1 ft | High tide 5:23 pm · 16.3 ft | Low tide 11:52 pm · 5.4 ft | Coef. 54 | 32% | Major periods 6:34 am · 6:57 pm | Medium |
| Wed 4 | 7:22 am · 4:41 pm | High tide 6:22 am · 15.7 ft | Low tide 12:14 pm · 6.6 ft | High tide 6:38 pm · 16.8 ft | — | Coef. 61 | 23% | Major periods 7:20 am · 7:43 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
Traeth Crigyll has no station of its own, so we use the tide at Holyhead (Environment Agency), 6.4 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: This uses Environment Agency tide gauge data from the real-time data API (Beta): Holyhead (E70524), https://environment.data.gov.uk/flood-monitoring/id/stations/E70524. Contains public sector information licensed under the Open Government Licence v3.0 (https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/). Modified: harmonic constants fitted by TidePlanet from the 15-minute sea levels of 2025-10-29 to 2026-10-22 (356 days).
The sea at Traeth Crigyll
Sea stateSea state: slight
The waves you may find
- Most commonMost common1.5 ft
- Significant3.1 ft
- Highest expectedHighest6.3 ft
One wave in seven is higher than the significant height, and about 3 times a day one reaches 6.3 ft. Before heading out, expect waves of up to 6.3 ft.
Wind on the coast and offshore
Onshore wind. The coast faces southwest and the wind blows straight in from the sea: more surf and backwash at the shore, and bait and boats drift toward land.
Wave height, next 7 daysWaves, next 7 days
Waves stay much the same all week. The biggest waves arrive on Friday 30: 3.7 ft with a period of 5 s, from the south-southwest (slight).
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 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 4:25 am (local time).
Surf in Traeth Crigyll today
Surf today
Poor- 1.7–2.6 ft surf at the shore, a fun size for most surfers
- 2.0 ft swell at 4 s from the southwest, short: weak, messy waves
- Light onshore wind (9 mph): a bit of chop
- Rising tide (high tide at 11:56 am)
- Light: First light 6:34 am · sunrise 7:11 am · sunset 4:52 pm · last light 5:29 pm
- Tide: low 5:43 am (3.6 ft), high 11:56 am (19.0 ft) and low 6:12 pm (3.4 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 55.9 °F: a 5/4 fullsuit with booties (and a hood if it’s windy).
- Energy: 15 kJ · Low power
Today’s surf at a glance
The best window is 7:00 am to 11:00 am, though with a short-period swell and onshore wind.
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 Traeth Crigyll today
Diving and snorkeling today
Likely visibility: good- Slack water around high tide (11:56 am): little current from 11:30 am to 12:20 pm
- 2.8 ft surface waves
- Moderate onshore wind (14 mph)
- 0.8 mph current toward the east-southeast (model)
- Sun high: more light underwater
- Slack water today: low tide 5:43 am (5:20–6:00 am), high tide 11:56 am (11:30 am–12:20 pm), low tide 6:12 pm (5:50–6:30 pm) and high tide 12:25 am (11:50 pm–12:50 am)
- Likely visibility: good. Swell (up to 3.7 ft at 8 s) over the last few days has stirred up the water. Based on the last 24 hours of data.
- Water at 55.9 °F: a 7 mm semi-dry suit, with hood, gloves and booties.
- Snorkeling: doable, with some waves or wind.
- Night dive: dark from 5:29 pm. Waning gibbous (85%), rising at 6:27 pm: a bright night.
Your diving day at a glance
The best window, 10:40 am to 12:30 pm, combines slack water at high tide and the sun high, though with moderate wind and current. Also worth a look from 4:00 pm to 4:50 pm, with light wind, though with tidal current and current.
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
- Asmund 6.4 mi
- Kimya 6.4 mi
- Kimya (part Of) 6.6 mi
- Town of Wexford 7.1 mi
- Dagmar 7.2 mi
- Alexandra 7.2 mi
- HMS Campina 7.4 mi
- Osseo 7.4 mi
- Kirkmichael 7.4 mi
- Wreck 3.4 mi
- Wreck 5.7 mi
- Anglesey Divers 6.4 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 Traeth Crigyll
Now in Traeth Crigyll
- Low / high
- 55 / 57 °F
- Rain
- 0.07 in · 14%
- Clouds
- 91%
- Humidity
- 86%
- Dew pointDew point
- 52 °F
- Visibility
- 16 mi
- UV indexUV
- 0 · low
- Air qualityAir
- Fair · 29
- 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 (+0.01 inHg in 3 hours). Over the next 48 hours: +0.15 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 | Overcast | Overcast | Overcast | Overcast | Overcast | Overcast | Overcast | Overcast |
| Temperature | 56° | 57° | 56° | 56° | 56° | 57° | 56° | 56° |
| Wind (mph) | 12 SW | 10 SW | 8 S | 11 S | 14 S | 11 S | 8 SSE | 9 SSE |
| Gusts | 17 | 17 | 14 | 17 | 21 | 19 | 13 | 14 |
| Waves | 3.3 ft | 3.2 ft | 2.9 ft | 2.7 ft | 2.8 ft | 2.8 ft | 2.8 ft | 3.1 ft |
| Rain | 0.01 in | 0.00 in | 0.01 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in |
- 6:00 am 56° 8 S 2.9 ft
- 9:00 am 56° 11 S 2.7 ft
- 12:00 pm 56° 14 S 2.8 ft
- 3:00 pm 57° 11 S 2.8 ft
- 6:00 pm 56° 8 SSE 2.8 ft
- 9:00 pm 56° 9 SSE 3.1 ft
- 12:00 am 55° 10 SSE 3.4 ft
- 3:00 am 55° 14 SSE 3.7 ft
Next 14 daysComing days
| Day | Sky | Low / high | Max wind | Max wave | High tides |
|---|---|---|---|---|---|
| Today · 29 | 55 / 57 °F | 14 mph S | 3.3 ft | 11:56 am | |
| Fri 30 | 53 / 57 °F | 14 mph SSE | 3.7 ft | 12:25 am · 12:44 pm | |
| Sat 31 | 48 / 57 °F | 6 mph S | 2.1 ft | 1:20 am · 1:40 pm | |
| Sun 1 | 53 / 57 °F | 9 mph NNE | 2.2 ft | 2:23 am · 2:44 pm | |
| Mon 2 | 47 / 53 °F | 12 mph ENE | 1.2 ft | 3:38 am · 4:00 pm | |
| Tue 3 | 44 / 53 °F | 13 mph ENE | 0.5 ft | 5:03 am · 5:23 pm | |
| Wed 4 | 43 / 51 °F | 8 mph ENE | 0.6 ft | 6:22 am · 6:38 pm | |
| Thu 5 | 44 / 53 °F | 9 mph ENE | 0.8 ft | 7:23 am · 7:37 pm | |
| Fri 6 | 43 / 50 °F | 9 mph NE | 0.7 ft | 8:11 am · 8:25 pm | |
| Sat 7 | 38 / 48 °F | 6 mph ENE | 1.2 ft | 8:51 am · 9:06 pm | |
| Sun 8 | 45 / 51 °F | 9 mph ENE | 1.8 ft | 9:26 am · 9:42 pm | |
| Mon 9 | 51 / 56 °F | 11 mph SE | 2.8 ft | 9:59 am · 10:17 pm | |
| Tue 10 | 51 / 55 °F | 5 mph E | 2.1 ft | 10:31 am · 10:50 pm | |
| Wed 11 | 52 / 55 °F | 15 mph S | 4.0 ft | 11:04 am · 11:24 pm |
- Fri 30 Overcast 53° / 57° 3.7 ft
- Sat 31 Overcast 48° / 57° 2.1 ft
- Sun 1 Overcast 53° / 57° 2.2 ft
- Mon 2 Overcast 47° / 53° 1.2 ft
- Tue 3 Overcast 44° / 53° 0.5 ft
- Wed 4 Overcast 43° / 51° 0.6 ft
- Thu 5 Mainly clear 44° / 53° 0.8 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 Next few weeks, compared with normal: normal temperatures, normal rain and a slightly warmer sea. See the outlook →
- Normal Today, normal highs for late October (55 °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 4:25 am (local time).
The sun in Traeth Crigyll
Sunrise and sunset
- First light 5:53 am
- Full dark 6:09 pm
- Civil dawn 6:34 am
- Civil dusk 5:29 pm
- Solar noon 12:02 pm (23° high)
- Daylight 9 h 42 min (−4 min)
- Evening golden hour 4:01 pm
- Full dark 6:09 pm
Golden hour and the day-night map
Today the sun is 92,335,245 mi away and looks 32′ 11″ across.
The moon in Traeth Crigyll
Moon phase and position
Today the moon is 226,641 mi away and looks 32′ 45″ across.
Solunar periods
Today's activity: medium- 1:44–3:44 am Major · the moon passes overhead · high activity
- 2:17–4:17 pm Major · the moon passes underfoot · high activity
- 11:36 am–12:36 pm Minor · moonset · medium activity
- 5:57–6:57 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 · 8:29 pmNov 1 in 3 days
- New moon Mon, Nov 9 · 7:03 amNov 9 in 11 days
- First quarter Tue, Nov 17 · 11:48 amNov 17 in 19 days
- Full moon Tue, Nov 24 · 2:54 pmNov 24 in 26 days
Next perigee (the moon at its closest to Earth): November 25, 223,281 mi away.
Where to fish in Traeth Crigyll
Piers, ramps and tackle shops nearby
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Jetty 4.1 mi
- Jetty 4.4 mi
- Jetty 7.3 mi
- Boat ramp 1.4 mi
- Boat ramp 3.8 mi
- Boat ramp 3.9 mi
- Boat ramp 4.4 mi
- Boat ramp 4.5 mi
- Boat ramp 4.7 mi
- Holyhead Marina 7.3 mi
- Valley Baits 1.5 mi
- Criccieth Tackle Box 3.4 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
Gentle slopeThe bottom slopes gently: 16 ft deep 0.5 mi from shore and 33 ft at 0.75 mi.
From the shoreline out to sea, heading southwest.
How far from shore
- 16 ft deep0.5 mi
- 33 ft deep0.75 mi
- 66 ft deep2.3 mi
- 164 ft deepnot within 3.1 mi
For fishing, swimming and diving
- Shore fishing. Shallow, gradual bottom (16 ft at 0.5 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 near shore: you only reach 33 ft at 0.75 mi. For dives deeper than 33 ft, go by boat.
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.
Tides near Traeth CrigyllTides nearby
- Rhosneigr0.9 mi
- Valley3.6 mi
- Aberffraw4.2 mi
- Bodedern4.2 mi
- Holyhead6.3 mi
- Malltraeth6.9 mi
- Dwyran10 mi
- Cemaes Bay13 mi
- Caernarfon13 mi
- Llanfairpwllgwyngyll14 mi
Traeth Crigyll at a glance
- Beach. Coordinates: 53.235° N, 4.537° W.
- It is 6.3 mi southeast of Holyhead, the main place in Anglesey. The sun rises 1 min earlier and sets at the same time than in Holyhead.
- In Rhosneigr, 0.9 mi from the center.
- The nearest tide station, Holyhead, is 6.5 mi to the northwest.
- Its coast faces southwest.
Questions about Traeth CrigyllQuestions
Where is Traeth Crigyll?
In Rhosneigr, 0.9 mi from the center, Anglesey (United Kingdom). The shore faces southwest.
What amenities does Traeth Crigyll have?
According to OpenStreetMap: restrooms and parking. Some may be missing or out of date, so ask at the beach.
What time is high tide today in Traeth Crigyll?
Today in Traeth Crigyll there is high tide at 11:56 am (19.0 ft) and low tides at 5:43 am and 6:12 pm. Tide coefficient 88.
What time is sunset today in Traeth Crigyll?
At 4:52 pm. There is light until the end of civil twilight, at 5:29 pm.
What time is sunrise tomorrow in Traeth Crigyll?
At 7:13 am. First light comes at 5:55 am.
What phase is the moon today?
Waning gibbous, 85% illuminated. New moon on Mon, Nov 9 · 7:03 am.
When are the next spring tides?
From November 9 to 11.
What are today's solunar periods?
Major 1:44–3:44 am, Minor 11:36 am–12:36 pm, Major 2:17–4:17 pm, Minor 5:57–6:57 pm. Today's activity is medium.
What's the weather like today in Traeth Crigyll?
Overcast, from 55 °F to 57 °F, with a gentle breeze from the south-southwest (9 mph) and a 14% chance of rain.
How is the sea today in Traeth Crigyll?
Slight (Douglas 3): 3.1 ft waves with a period of 5.7 s from the southwest. The water is 55.9 °F.
When is the best time to visit Traeth Crigyll?
The best time to visit Traeth Crigyll is from June to August: highs of 63 °F to 66 °F, about 12 rainy days a month and 6 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: Holyhead tide gauge (UK National Tide Gauge Network). This uses Environment Agency tide gauge data from the real-time data API (Beta), under the Open Government Licence v3.0; constants fitted by TidePlanet from a year of its readings. Sun and moon: our own calculation with astronomy-engine. Places: GeoNames (CC BY 4.0). Coastline: © OpenStreetMap contributors (ODbL).