Niton tides today
- Tide now 12.1 ft ↑ rising · high 1:00 am (13.0 ft)
- Best time tomorrow 6:20–7:00 am good day · 8/10
- Beach day Not today Not a beach day · 0/10
- Waves · water 2.4 ft · 59 °F slight · 8.1 s from the west-southwest
- Wind · air 9 mph · 59 °F from the W, gusts 12 · overcast
- Sun 6:49 am–4:48 pm 9 h 58 min of daylight
- Moon 92% · 5:37 pm waning gibbous · rises at 5:37 pm
- Diving tomorrow 11:50 am–12:30 pm average day · 6/10
Today in Niton there are high tides at 12:11 am (13.0 ft) and 12:32 pm (13.3 ft) and low tides at 5:19 am and 5:41 pm. Tide coefficient 92. Right now the tide is rising toward the high tide at 1:00 am. The sun rises at 6:49 am and sets at 4:48 pm: 9 h 58 min of daylight. The moon is 92% illuminated (waning gibbous) and rises at 5:37 pm. Major solunar periods run from 12:27 am to 2:27 am and from 12:59 pm to 2:59 pm. The next spring tides arrive from October 26 to 28. The sea is slight, with 2.4 ft waves. There's a gentle breeze from the west (9 mph). Overcast, 59 °F.
Fishing in Niton today
Best time to fish
Solunar activity today: high- Low tide at 5:41 pm
- Minor period 5:07–6:07 pm (moonrise)
- Sunset at 4:48 pm, golden hour from 4:00 pm
- Rising pressure (+0.32 inHg in 24 h), moderate cross-shore wind (17 mph) and some swell (3.2 ft waves) to stir the water
- Waning gibbous: a bit more activity than at the quarters
- Highest tide coefficient today: 92 (spring tides)
- A minor period lines up with sunset
Your day at a glance
The best window, 4:40 pm to 5:20 pm, combines the 5:41 pm low tide, moonrise, sunset and some swell, though with rising pressure and moderate wind. Also worth a try from 12:30 am to 1:10 am, with the 12:11 am high tide, a major period and some swell, though with rising pressure and fresh wind.
Species with the most records nearby: thornback ray, small-spotted catshark, European plaice and common sole. October is one of the months when these are seen most: thornback ray and small-spotted catshark. What you can catch
Beach day in Niton
Is it a beach day?
- Cloudy (76% cloud cover)
- Feels like 52 °F: chilly for the beach
- Fresh cross-shore wind (21 mph): blowing sand
- Swim with care: 3.9 ft waves every 7 s; moderate rip current risk
- Water at 59 °F (cold)
- High tide at 12:32 pm, coefficient 91: little sand left
Today, hour by hour
- Swimming Use care · 3.9 ft
3.9 ft waves every 7 s: swim with care and stay where you can stand. Moderate rip current risk. Always follow the lifeguard's flags.
- Water 59 °F
Cold: ease in slowly.
- Sun & sunscreen UV 2 · SPF 15
Max UV 2 (low): SPF 15 sunscreen.
- Wind 21 mph
Fresh cross-shore wind (21 mph): blowing sand.
- Tide & sand 5:19 am
Low tide at 5:19 am and 5:41 pm: that's when there's the most sand. High tide at 12:11 am and 12:32 pm. Coefficient 92 (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 Niton
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Rocken End Beach 1.4 mi · W
- Restrooms
- Parking
- Nudity allowed
- Ventnor Beach 3.4 mi · E
- Lifeguard
- Restrooms
- Showers
- Parking
Excellent water quality 2025 season, Environment Agency
- Small Hope Beach 6.1 mi · NE
- Restrooms
- Showers
- 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).
UK bathing water quality: Environment Agency. Contains public sector information licensed under the Open Government Licence v3.0. Full attribution.
Webcams near Niton
Webcams provided by windy.com — add a webcam
Tides in Niton
Today's high and low tides
- ▲ High tide 12:11 am 13.0 ft · coef. 92
- ▼ Low tide 5:19 am 1.6 ft
- ▲ High tide 12:32 pm 13.3 ft · coef. 91
- ▼ Low tide 5:41 pm 1.4 ft
↑ Rising The tide is rising. 1 h 10 min to high tide at 1:00 am.
Tide coefficient 92 for the 12:11 am high tide and 91 for the 12:32 pm high tide. Spring tides. The water rises and falls 11.9 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 September 12 (13.6 ft) and the lowest, on March 21 (0.6 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 12 (coefficient 92, 11.7 ft range). The smallest, from October 19 to 20 (coefficient 35, 3.9 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 | 6:49 am · 4:48 pm | High tide 12:11 am · 13.0 ft | Low tide 5:19 am · 1.6 ft | High tide 12:32 pm · 13.3 ft | Low tide 5:41 pm · 1.4 ft | Coef. 92 | 92% | Major periods 12:27 am · 12:59 pm | High |
| Thu 29 | 6:51 am · 4:46 pm | High tide 1:00 am · 13.0 ft | Low tide 6:01 am · 1.9 ft | High tide 1:18 pm · 13.0 ft | Low tide 6:24 pm · 1.6 ft | Coef. 89 | 85% | Major periods 1:31 am · 2:03 pm | Medium |
| Fri 30 | 6:53 am · 4:44 pm | High tide 1:52 am · 12.7 ft | Low tide 6:45 am · 2.5 ft | High tide 2:08 pm · 12.5 ft | Low tide 7:10 pm · 2.1 ft | Coef. 83 | 76% | Major periods 2:35 am · 3:07 pm | Medium |
| Sat 31 | 6:54 am · 4:42 pm | High tide 2:47 am · 12.3 ft | Low tide 7:34 am · 3.2 ft | High tide 3:04 pm · 11.9 ft | Low tide 8:03 pm · 2.9 ft | Coef. 75 | 65% | Major periods 3:38 am · 4:08 pm | Medium |
| Sun 1 | 6:56 am · 4:41 pm | High tide 3:49 am · 11.9 ft | Low tide 8:32 am · 4.1 ft | High tide 4:10 pm · 11.3 ft | Low tide 9:10 pm · 3.7 ft | Coef. 64 | Last quarter | Major periods 4:37 am · 5:05 pm | Medium |
| Mon 2 | 6:58 am · 4:39 pm | High tide 4:57 am · 11.5 ft | Low tide 9:55 am · 4.9 ft | High tide 5:23 pm · 10.9 ft | Low tide 10:46 pm · 4.2 ft | Coef. 56 | 43% | Major periods 5:31 am · 5:56 pm | Medium |
| Tue 3 | 7:00 am · 4:37 pm | High tide 6:08 am · 11.4 ft | Low tide 11:46 am · 4.9 ft | High tide 6:37 pm · 10.9 ft | — | Coef. 54 | 32% | Major periods 6:20 am · 6:44 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
Niton has no station of its own, so we use the tide at Sandown Pier (TICON-4), 7.3 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 Niton
Sea stateSea state: slight
The waves you may find
- Most commonMost common1.2 ft
- Significant2.4 ft
- Highest expectedHighest4.9 ft
One wave in seven is higher than the significant height, and about 3 times a day one reaches 4.9 ft. Before heading out, expect waves of up to 4.9 ft.
Wind on the coast and offshore
Cross-shore wind. The coast faces south and the wind blows along the shore: drift and current run parallel to the beach.
Wave height, next 7 daysWaves, next 7 days
Waves ease over the next few days. The biggest waves arrive on Wednesday 28: 4.2 ft with a period of 8 s, from the west-southwest (moderate).
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 58.0 °F by Tuesday 3.
Water warmer than normal for late October (+1.0 °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 11:50 pm (local time).
Nearest marine station
This is a real measurement of the sea, not a forecast. Data from Channel Coastal Observatory (CCO), National Network of Regional Coastal Monitoring Programmes (NNRCMP), via the E.U. Copernicus Marine Service. Generated using E.U. Copernicus Marine Service Information (doi:10.48670/moi-00036).
Surf in Niton today
Surf today
Poor- 2.5–3.8 ft surf at the shore, a fun size for most surfers
- 2.8 ft swell at 9 s from the west-southwest, a bit short
- 2.6 ft wind swell at 4 s: messy waves
- Fresh cross-shore wind (18 mph): a bit of chop
- First or last light of the day
- Rising tide (high tide at 12:32 pm)
- Light: First light 6:15 am · sunrise 6:49 am · sunset 4:48 pm · last light 5:22 pm
- Tide: high 12:11 am (13.0 ft), low 5:19 am (1.6 ft), high 12:32 pm (13.3 ft) and low 5:41 pm (1.4 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 59.0 °F: a 4/3 fullsuit (booties if you run cold).
- Energy: 132 kJ · Medium power
Today’s surf at a glance
The best window, 6:15 am to 10:00 am, has a good size, though with wind swell and cross-shore wind. 4:00 pm to 5:00 pm can also work, with a good size, though with cross-shore 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 Niton today
Diving and snorkeling today
Likely visibility: poor- Tidal current running: mid-tide, the water is moving
- 2.1 ft swell at 9 s from the west-southwest: some surge on the bottom
- Moderate cross-shore wind (17 mph)
- 0.2 mph current toward the west-northwest, weak (model)
- Low light: twilight
- Slack water today: high tide 12:11 am (11:50 pm–12:40 am), low tide 5:19 am (5:04–5:34 am), high tide 12:32 pm (12:10–1:00 pm) and low tide 5:41 pm (5:26–5:56 pm)
- Likely visibility: poor. Swell (up to 3.4 ft at 9 s), rain (0.25 in) and wind over the last few days have stirred up the water. Based on the last 24 hours of data.
- Water at 59.0 °F: a 7 mm wetsuit, with hood and booties.
- Snorkeling: doable, with some waves or wind.
- Night dive: dark from 5:22 pm. Waning gibbous (92%), rising at 5:37 pm: a bright night.
Your diving day at a glance
The best window, 4:30 pm to 5:20 pm, lines up with weak current, though with tidal current, moderate wind and low light. Also worth a look from 10:40 am to 11:30 am, with weak current and the sun high, though with tidal current, some swell and fresh wind.
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
- Volkerak 1.7 mi
- Albatros 1.9 mi
- Oriflamme 2.4 mi
- Isleworth 3.0 mi
- Asborg 4.0 mi
- Luis 5.4 mi
- Grip Fast 5.6 mi
- Braat II 6.2 mi
- Wreck 4.3 mi
- Isle Of Wight Dolphins Bsac 807 9.3 mi
- Vectis Expeditions Ltd 12 mi
- Island Divers 12 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 Niton
Now in Niton
- Low / high
- 58 / 60 °F
- Rain
- 0.00 in · 0%
- Clouds
- 89%
- Humidity
- 78%
- Dew pointDew point
- 52 °F
- Visibility
- 18 mi
- UV indexUV
- 0 · low
- Air qualityAir
- Fair · 32
- 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: +0.05 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 | Mainly clear | Partly cloudy | Overcast | Partly cloudy | Overcast | Overcast | Overcast | Overcast |
| Temperature | 58° | 58° | 58° | 58° | 59° | 60° | 59° | 59° |
| Wind (mph) | 22 W | 21 W | 19 W | 21 W | 21 W | 19 W | 16 WSW | 13 W |
| Gusts | 29 | 30 | 26 | 25 | 26 | 23 | 21 | 16 |
| Waves | 4.2 ft | 3.8 ft | 3.9 ft | 3.9 ft | 3.8 ft | 3.5 ft | 3.1 ft | 2.7 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 59° 9 W 2.4 ft
- 3:00 am 59° 6 WSW 2.1 ft
- 6:00 am 58° 4 ENE 1.8 ft
- 9:00 am 59° 5 SSW 1.6 ft
- 12:00 pm 59° 6 ESE 1.5 ft
- 3:00 pm 59° 10 ESE 1.4 ft
- 6:00 pm 59° 9 ESE 1.6 ft
- 9:00 pm 59° 16 E 1.8 ft
Next 14 daysComing days
| Day | Sky | Low / high | Max wind | Max wave | High tides |
|---|---|---|---|---|---|
| Today · 28 | 58 / 60 °F | 23 mph W | 4.2 ft | 12:11 am · 12:32 pm | |
| Thu 29 | 57 / 60 °F | 16 mph ESE | 2.4 ft | 1:00 am · 1:18 pm | |
| Fri 30 | 55 / 60 °F | 22 mph E | 2.4 ft | 1:52 am · 2:08 pm | |
| Sat 31 | 51 / 56 °F | 11 mph ENE | 2.4 ft | 2:47 am · 3:04 pm | |
| Sun 1 | 49 / 52 °F | 6 mph NNE | 1.8 ft | 3:49 am · 4:10 pm | |
| Mon 2 | 48 / 54 °F | 14 mph NNE | 2.4 ft | 4:57 am · 5:23 pm | |
| Tue 3 | 48 / 56 °F | 14 mph NNE | 2.8 ft | 6:08 am · 6:37 pm | |
| Wed 4 | 49 / 53 °F | 12 mph NE | 3.6 ft | 7:17 am · 7:45 pm | |
| Thu 5 | 46 / 52 °F | 14 mph ENE | 3.7 ft | 8:21 am · 8:46 pm | |
| Fri 6 | 49 / 53 °F | 17 mph ENE | 2.3 ft | 9:16 am · 9:38 pm | |
| Sat 7 | 49 / 56 °F | 13 mph E | 5.1 ft | 10:03 am · 10:24 pm | |
| Sun 8 | 53 / 57 °F | 10 mph S | 2.6 ft | 10:45 am · 11:06 pm | |
| Mon 9 | 56 / 58 °F | 10 mph SSE | 3.3 ft | 11:21 am · 11:44 pm | |
| Tue 10 | 56 / 60 °F | 16 mph SW | 4.7 ft | 11:54 am |
- Thu 29 Overcast 57° / 60° 2.4 ft
- Fri 30 Partly cloudy 55° / 60° 2.4 ft
- Sat 31 Overcast 51° / 56° 2.4 ft
- Sun 1 Overcast 49° / 52° 1.8 ft
- Mon 2 Overcast 48° / 54° 2.4 ft
- Tue 3 Partly cloudy 48° / 56° 2.8 ft
- Wed 4 Light drizzle 49° / 53° 3.6 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 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, warmer than normal for late October (+3.6 °F; normal high: 56 °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 11:50 pm (local time).
The sun in Niton
Sunrise and sunset
- First light 5:37 am
- Full dark 6:00 pm
- Civil dawn 6:15 am
- Civil dusk 5:22 pm
- Solar noon 11:49 am (26° high)
- Daylight 9 h 58 min (−4 min)
- Evening golden hour 4:00 pm
- Full dark 6:00 pm
Golden hour and the day-night map
Today the sun is 92,359,774 mi away and looks 32′ 11″ across.
The moon in Niton
Moon phase and position
Today the moon is 226,451 mi away and looks 32′ 47″ across.
Solunar periods
Today's activity: high- 12:27–2:27 am Major · the moon passes overhead · high activity
- 12:59–2:59 pm Major · the moon passes underfoot · high activity
- 9:44–10:44 am Minor · moonset · medium activity
- 5:07–6:07 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 4 days
- New moon Mon, Nov 9 · 7:03 amNov 9 in 12 days
- First quarter Tue, Nov 17 · 11:48 amNov 17 in 20 days
- Full moon Tue, Nov 24 · 2:54 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 Niton
Piers, ramps and tackle shops nearby
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Sandown Pier 7.3 mi
- Boat ramp 0.7 mi
- Boat ramp 2.7 mi
- Boat ramp 2.9 mi
- Ventnor Haven Slipway 3.5 mi
- Boat ramp 3.7 mi
- Boat ramp 3.9 mi
- Boat ramp 4.5 mi
- Ventnor Haven 3.5 mi
- Chivertons 3.6 mi
- Rookley Fishery 4.6 mi
- UK Hooks 5.9 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
Deepens quicklyThe bottom deepens quickly: 33 ft of water 0.3 mi from shore. It reaches 164 ft at 1.8 mi.
From the shoreline (0.65 mi from Niton) out to sea, heading south.
How far from shore
- 16 ft deep1,150 ft
- 33 ft deep0.3 mi
- 66 ft deep0.35 mi
- 164 ft deep1.8 mi
For fishing, swimming and diving
- Shore fishing. 33 ft of water just 0.3 mi from shore: a good cast reaches deep water. Current and surf hit harder here.
- Swimming. The water gets deeper little by little, but a few dozen yards out you can no longer stand.
- Diving. Shore diving works here: 33 ft at 0.3 mi and 66 ft at 0.35 mi from shore.
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
The Old Lighthouse 0.9 mi northwest
Other lighthouses nearby: St Catherine's Oratory (0.9 mi northwest), St. Catherine's Lighthouse (1.0 mi southwest).
Data from Wikidata. For reference only: not for navigation. Wikidata · Sources and licenses
Tides near NitonTides nearby
- Wroxall3.4 mi
- Ventnor3.5 mi
- Shanklin5.4 mi
- Brighstone6.2 mi
- Sandown7.0 mi
- Newport7.9 mi
- Brading8.9 mi
- Wootton10 mi
- St. Helens11 mi
- Cranmore11 mi
Niton at a glance
- Town or city of about 1,162 people. Coordinates: 50.587° N, 1.285° W.
- It is 12 mi south of Cowes, the main place in Wight. The sun rises at the same time and sets at the same time than in Cowes.
- The nearest tide station, Sandown Pier, is 7.3 mi to the northeast.
- Its coast faces south.
Questions about NitonQuestions
What time is high tide today in Niton?
Today in Niton there are high tides at 12:11 am (13.0 ft) and 12:32 pm (13.3 ft) and low tides at 5:19 am and 5:41 pm. Tide coefficient 92.
What time is sunset today in Niton?
At 4:48 pm. There is light until the end of civil twilight, at 5:22 pm.
What time is sunrise tomorrow in Niton?
At 6:51 am. First light comes at 5:38 am.
What phase is the moon today?
Waning gibbous, 92% illuminated. New moon on Mon, Nov 9 · 7:03 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 12:27–2:27 am, Minor 9:44–10:44 am, Major 12:59–2:59 pm, Minor 5:07–6:07 pm. Today's activity is high.
What's the weather like today in Niton?
Overcast, from 58 °F to 60 °F, with a gentle breeze from the west (9 mph) and a 0% chance of rain.
How is the sea today in Niton?
Slight (Douglas 3): 2.4 ft waves with a period of 8.1 s from the west-southwest. The water is 59.0 °F.
When is the best time to visit Niton?
The best time to visit Niton is from July to August: highs of 70 °F, about 8 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: Sandown Pier 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).