Fortaleza tides today
- Tide now 3.8 ft ↑ rising · high 6:30 am (7.3 ft)
- Best time to fish 5:30–6:30 am average day · 6/10
- Beach day 2:00–5:00 pm Good beach day · 7/10
- Waves · water 4.9 ft · 84 °F moderate · 6.1 s from the east-northeast
- Wind · air 11 mph · 80 °F from the ESE, gusts 21 · light drizzle
- Surf today 2.1–3.2 ft Poor day · 3/10 · 5:00–9:00 am
- Sun 5:11 am–5:25 pm 12 h 14 min of daylight
- Moon 84% · 9:04 pm waning gibbous · rises at 9:04 pm
Today in Fortaleza there are high tides at 6:30 am (7.3 ft) and 6:46 pm (7.9 ft) and low tides at 12:13 am and 12:23 pm. Tide coefficient 86. Right now the tide is rising toward the high tide at 6:30 am. The sun rises at 5:11 am and sets at 5:25 pm: 12 h 14 min of daylight. The moon is 84% illuminated (waning gibbous) and rises at 9:04 pm. Major solunar periods run from 1:06 am to 3:06 am and from 1:39 pm to 3:39 pm. The next spring tides arrive from November 9 to 11. The sea is moderate, with 4.9 ft waves. There's a gentle breeze from the east-southeast (11 mph). Light drizzle, 80 °F.
Fishing in Fortaleza today
Best time to fish
Solunar activity today: medium- High tide at 6:30 am, coefficient 86
- Sunrise at 5:11 am
- Steady pressure (29.91 inHg), light offshore wind (12 mph) and some swell (4.8 ft waves) to stir the water
- Waning gibbous: a bit more activity than at the quarters
- Highest tide coefficient today: 86 (average tides)
Your day at a glance
The best window, 5:30 am to 6:30 am, combines the 6:30 am high tide, sunrise and some swell. Also good from 5:50 pm to 7:50 pm, with the 6:46 pm high tide, a light onshore breeze and some swell. Also good from 12:30 am to 1:10 am, with the 12:13 am low tide, a major period and some swell.
Species with the most records nearby: lane snapper, great barracuda, mutton snapper and yellowtail snapper. October is one of the months when these are seen most: mutton snapper. What you can catch
Beach day in Fortaleza
Is it a beach day?
3 good hours- Sunny
- Feels like 92 °F: hot
- Cross-shore breeze (12 mph)
- UV 6 (moderate): SPF 30 sunscreen
- Water at 84 °F (very warm)
- Swim with care: 4.2 ft waves every 6 s
Today, hour by hour
- Swimming Use care · 4.2 ft
4.2 ft waves every 6 s: swim with care and stay where you can stand. Low rip current risk. Always follow the lifeguard's flags.
- Water 84 °F
Very warm: barely refreshing.
- Sun & sunscreen UV 12 · SPF 50
Max UV 12 (extreme): SPF 50 sunscreen, reapplied every 2 hours. Seek shade 10:00 am–2:00 pm (very high UV).
- Wind 14 mph
Moderate offshore wind (14 mph). Skip the inflatables: offshore wind carries them out to sea.
- Tide & sand 12:23 pm
Low tide at 12:13 am and 12:23 pm: that's when there's the most sand. High tide at 6:30 am and 6:46 pm.
The best window, 2:00 pm to 5:00 pm, brings sunshine, beach weather, little wind and water at 84 °F, though with some waves.
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 Fortaleza
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Praia Leste Oeste 0.2 mi · NE
- Parking
- Praia do Marina 0.8 mi · E
- Parking
- Praia do Havaizinho 1.6 mi · E
- Parking
- Praia dos Crush 2.0 mi · E
- Lifeguard
- Restrooms
- Parking
- Praia de Iracema 2.4 mi · E
- Lifeguard
- Restrooms
- Showers
- Parking
- Praia do Meireles 3.0 mi · E
- Lifeguard
- Restrooms
- Showers
- Parking
- Praia do Mucuripe 3.8 mi · E
- Lifeguard
- Restrooms
- Showers
- Parking
- Porto dos Botes 4.6 mi · E
- 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).
Webcams near Fortaleza
Webcams provided by windy.com — add a webcam
Tides in Fortaleza
Today's high and low tides
- ▼ Low tide 12:13 am -0.4 ft
- ▲ Next high tide 6:30 am 7.3 ft · coef. 86
- ▼ Low tide 12:23 pm 0.5 ft
- ▲ High tide 6:46 pm 7.9 ft · coef. 81
↑ Rising The tide is rising. 3 h 6 min to high tide at 6:30 am.
Tide coefficient 86 for the 6:30 am high tide and 81 for the 6:46 pm high tide. Average coefficient. The water rises and falls 8.2 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 25 (8.9 ft) and the lowest, on May 17 (-1.1 ft).
Semidiurnal: two high and two low tides a day, of similar height.
Heights above MLWS. Astronomical prediction: wind and air pressure can raise or lower the water by a few inches, and more in a storm. Not for navigation. MLWS
Tide coefficient and range in October
The biggest tides of the month came from October 26 to 27 (coefficient 98, 9.1 ft range). The smallest, on October 18 (coefficient 28, 3.2 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 | 5:11 am · 5:25 pm | Low tide 12:13 am · -0.4 ft | High tide 6:30 am · 7.3 ft | Low tide 12:23 pm · 0.5 ft | High tide 6:46 pm · 7.9 ft | Coef. 86 | 84% | Major periods 1:06 am · 1:39 pm | Medium |
| Fri 30 | 5:11 am · 5:25 pm | Low tide 1:05 am · 0.1 ft | High tide 7:26 am · 6.8 ft | Low tide 1:15 pm · 1.1 ft | High tide 7:42 pm · 7.4 ft | Coef. 74 | 75% | Major periods 2:11 am · 2:43 pm | Low |
| Sat 31 | 5:11 am · 5:25 pm | Low tide 2:04 am · 0.6 ft | High tide 8:30 am · 6.2 ft | Low tide 2:16 pm · 1.7 ft | High tide 8:48 pm · 6.9 ft | Coef. 62 | 64% | Major periods 3:14 am · 3:43 pm | Medium |
| Sun 1 | 5:10 am · 5:25 pm | Low tide 3:16 am · 1.2 ft | High tide 9:46 am · 6.0 ft | Low tide 3:33 pm · 2.1 ft | High tide 10:06 pm · 6.6 ft | Coef. 53 | Last quarter | Major periods 4:12 am · 4:39 pm | Medium |
| Mon 2 | 5:10 am · 5:25 pm | Low tide 4:41 am · 1.4 ft | High tide 11:06 am · 6.0 ft | Low tide 5:04 pm · 2.2 ft | High tide 11:27 pm · 6.6 ft | Coef. 53 | 42% | Major periods 5:05 am · 5:30 pm | Medium |
| Tue 3 | 5:10 am · 5:25 pm | Low tide 5:59 am · 1.3 ft | High tide 12:17 pm · 6.4 ft | Low tide 6:21 pm · 1.8 ft | — | Coef. 57 | 31% | Major periods 5:54 am · 6:18 pm | Low |
| Wed 4 | 5:10 am · 5:25 pm | High tide 12:39 am · 6.9 ft | Low tide 6:58 am · 1.0 ft | High tide 1:14 pm · 6.8 ft | Low tide 7:19 pm · 1.4 ft | Coef. 65 | 22% | Major periods 6:40 am · 7:03 pm | Low |
▲ high tide · ▼ low tide · heights above MLWS. 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 Fortaleza station (TICON-4), 4.1 mi from Fortaleza. 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 Fortaleza
Sea stateSea state: moderate
The waves you may find
- Most commonMost common2.4 ft
- Significant4.9 ft
- Highest expectedHighest10.0 ft
One wave in seven is higher than the significant height, and about 3 times a day one reaches 10.0 ft. Before heading out, expect waves of up to 10.0 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 stay much the same all week. The biggest waves arrive on Thursday 29: 4.9 ft with a period of 6 s, from the east-northeast (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 (+3.1 °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 3:24 am (local time).
Surf in Fortaleza today
Surf today
Poor- 2.1–3.2 ft surf at the shore, a fun size for most surfers
- 2.6 ft swell at 5 s from the east-northeast, short: weak, messy waves
- 3.3 ft wind swell at 4 s: messy waves
- Light offshore wind (12 mph): it holds up and grooms the waves
- Rising tide (low tide at 12:23 pm)
- Light: First light 4:50 am · sunrise 5:11 am · sunset 5:25 pm · last light 5:46 pm
- Tide: low 12:13 am (-0.4 ft), high 6:30 am (7.3 ft), low 12:23 pm (0.5 ft) and high 6:46 pm (7.9 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 83.7 °F: boardshorts or a swimsuit and a rash guard.
- Energy: 60 kJ · Low power
Today’s surf at a glance
The best window, 5:00 am to 9:00 am, has a good size and light offshore wind, though with a short-period swell and wind swell. 10:00 am to 11:00 am can also work, with a good size and light offshore wind, though with a short-period swell and wind 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 Fortaleza today
Diving and snorkeling today
Likely visibility: good- Slack water around high tide (6:30 am): little current from 6:10 am to 6:50 am
- 4.8 ft waves: careful getting in and out
- Light offshore wind (12 mph)
- 0.2 mph current toward the west-northwest, weak (model)
- Daylight
- Slack water today: low tide 12:13 am (11:50 pm–12:30 am), high tide 6:30 am (6:10–6:50 am), low tide 12:23 pm (12:00–12:50 pm) and high tide 6:46 pm (6:20–7:10 pm)
- Likely visibility: good. Swell (up to 3.0 ft at 6 s) over the last few days has stirred up the water. Based on the last 24 hours of data.
- Water at 83.7 °F: a shorty or a rash guard.
- Snorkeling: better not, with these waves, wind or current.
- Night dive: dark from 5:46 pm. Waning gibbous (84%), rising at 9:04 pm: a bright night.
Your diving day at a glance
The best window, 5:30 am to 6:30 am, combines slack water at high tide, light wind and weak current, though with waves. Also worth a look from 11:40 am to 1:10 pm, with slack water at low tide, weak current and the sun high, though with waves and moderate wind. Also worth a look from 4:40 pm to 5:20 pm, with light wind and weak current, though with tidal 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
- Mara Hope 1.2 mi
- Amazonia 3.6 mi
- Beny 4.0 mi
- Lagoa Do Paraíso - Jijoca De Jericoacoara, Jericoacoara, Fortaleza Ce 2.3 mi
- Atlantida Mergulho Ceara 5.9 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 Fortaleza
Now in Fortaleza
- Low / high
- 80 / 87 °F
- Rain
- 0.06 in · 47%
- Clouds
- 69%
- Humidity
- 78%
- Dew pointDew point
- 73 °F
- Visibility
- 15 mi
- UV indexUV
- 0 · low
- Air qualityAir
- Fair · 27
- Saharan dust
- No
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 (−0.03 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 | Overcast | Light drizzle | Light drizzle | Light drizzle | Light drizzle | Clear sky | Clear | Mainly clear |
| Temperature | 81° | 80° | 81° | 86° | 87° | 85° | 82° | 81° |
| Wind (mph) | 13 E | 11 E | 12 ESE | 14 ESE | 13 ESE | 11 E | 10 ENE | 12 ENE |
| Gusts | 24 | 21 | 23 | 31 | 31 | 28 | 22 | 24 |
| Waves | 4.7 ft | 4.9 ft | 4.8 ft | 4.6 ft | 4.3 ft | 4.1 ft | 3.9 ft | 4.3 ft |
| Rain | 0.00 in | 0.01 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in | 0.00 in |
- 3:00 am 80° 11 E 4.9 ft
- 6:00 am 81° 12 ESE 4.8 ft
- 9:00 am 86° 14 ESE 4.6 ft
- 12:00 pm 87° 13 ESE 4.3 ft
- 3:00 pm 85° 11 E 4.1 ft
- 6:00 pm 82° 10 ENE 3.9 ft
- 9:00 pm 81° 12 ENE 4.3 ft
- 12:00 am 81° 11 ENE 4.5 ft
Next 14 daysComing days
| Day | Sky | Low / high | Max wind | Max wave | High tides |
|---|---|---|---|---|---|
| Today · 29 | 80 / 87 °F | 14 mph E | 4.9 ft | 6:30 am · 6:46 pm | |
| Fri 30 | 79 / 87 °F | 12 mph E | 4.5 ft | 7:26 am · 7:42 pm | |
| Sat 31 | 80 / 87 °F | 13 mph E | 4.3 ft | 8:30 am · 8:48 pm | |
| Sun 1 | 80 / 87 °F | 13 mph E | 4.4 ft | 9:46 am · 10:06 pm | |
| Mon 2 | 80 / 87 °F | 14 mph E | 4.5 ft | 11:06 am · 11:27 pm | |
| Tue 3 | 80 / 87 °F | 14 mph E | 4.7 ft | 12:17 pm | |
| Wed 4 | 80 / 86 °F | 14 mph E | 4.7 ft | 12:39 am · 1:14 pm | |
| Thu 5 | 80 / 87 °F | 13 mph E | 4.5 ft | 1:36 am · 2:01 pm | |
| Fri 6 | 80 / 86 °F | 12 mph E | 4.5 ft | 2:23 am · 2:41 pm | |
| Sat 7 | 80 / 87 °F | 12 mph E | 4.5 ft | 3:05 am · 3:18 pm | |
| Sun 8 | 80 / 87 °F | 12 mph E | 4.6 ft | 3:42 am · 3:53 pm | |
| Mon 9 | 80 / 87 °F | 11 mph E | 4.1 ft | 4:18 am · 4:27 pm | |
| Tue 10 | 81 / 87 °F | 12 mph E | 4.2 ft | 4:54 am · 5:01 pm | |
| Wed 11 | 80 / 87 °F | 15 mph ESE | 5.1 ft | 5:29 am · 5:36 pm |
- Fri 30 Partly cloudy 79° / 87° 4.5 ft
- Sat 31 Partly cloudy 80° / 87° 4.3 ft
- Sun 1 Partly cloudy 80° / 87° 4.4 ft
- Mon 2 Partly cloudy 80° / 87° 4.5 ft
- Tue 3 Light drizzle 80° / 87° 4.7 ft
- Wed 4 Partly cloudy 80° / 86° 4.7 ft
- Thu 5 Overcast 80° / 87° 4.5 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.
- Normal Today, normal highs for late October (87 °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 3:24 am (local time).
The sun in Fortaleza
Sunrise and sunset
- First light 4:25 am
- Full dark 6:11 pm
- Civil dawn 4:50 am
- Civil dusk 5:46 pm
- Solar noon 11:18 am (80° high)
- Daylight 12 h 14 min (+0 min)
- Evening golden hour 4:57 pm
- Full dark 6:11 pm
Golden hour and the day-night map
Today the sun is 92,332,964 mi away and looks 32′ 11″ across.
The moon in Fortaleza
Moon phase and position
Today the moon is 226,718 mi away and looks 32′ 44″ across.
Solunar periods
Today's activity: medium- 1:06–3:06 am Major · the moon passes overhead · high activity
- 1:39–3:39 pm Major · the moon passes underfoot · high activity
- 7:44–8:44 am Minor · moonset · medium activity
- 8:34–9:34 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 · 5:29 pmNov 1 in 3 days
- New moon Mon, Nov 9 · 4:03 amNov 9 in 11 days
- First quarter Tue, Nov 17 · 8:48 amNov 17 in 19 days
- Full moon Tue, Nov 24 · 11:54 amNov 24 in 26 days
Next perigee (the moon at its closest to Earth): November 25, 223,281 mi away.
Where to fish in Fortaleza
Piers, ramps and tackle shops nearby
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- English Pier 1.8 mi
- Jetty 0.3 mi
- Jetty 0.5 mi
- Jetty 0.6 mi
- Jetty 0.9 mi
- Jetty 0.9 mi
- Jetty 1.2 mi
- Jetty 1.3 mi
- Jetty 1.5 mi
- Tudo de Pesca 1.3 mi
- O Xavier Artigos de Pesca 1.4 mi
- Ipesca Indústria de Frio e Pesca 1.7 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.
From the shoreline (0.3 mi from Fortaleza) out to sea, heading north.
How far from shore
- 16 ft deep650 ft
- 33 ft deep0.3 mi
- 66 ft deepnot within 3.1 mi
- 164 ft deepnot within 3.1 mi
For fishing, swimming and diving
- Shore fishing. Deep water close in: about 6.9 ft just 330 ft out. Good for casting from rocks, jetties or the beach itself; 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. 33 ft deep 0.3 mi from shore; 66 ft is far out (beyond 3.1 mi): for deeper dives, go by boat.
Rough estimate: here the data comes in cells of about 0.3 mi and misses details near shore (rocks, sandbars, small coves).
Source: NOAA ETOPO 2022 (CC0), cells of about 0.3 mi; depth below mean sea level. For reference only: not for navigation or anchoring.
Nearest lighthouse
Mucuripe Lighthouse (old) 5.1 mi east
- Built
- 1846
Other lighthouses nearby: Mucuripe lighthouse (1958) (5.4 mi east).
Data from Wikidata. For reference only: not for navigation. Wikidata · Sources and licenses
Tides near FortalezaTides nearby
- Volta da Jurema3.3 mi
- Mucuripe4.2 mi
- Praia de Mucurpe4.3 mi
- Iparana5.9 mi
- Caucaia7.7 mi
- Cumbuco8.5 mi
- Icaraí8.8 mi
- Jardim Fortaleza12 mi
- Fazenda São João da Boa Vista13 mi
- Aquiraz16 mi
Fortaleza at a glance
- Town or city of about 2,400,000 people. Coordinates: 3.717° S, 38.543° W.
- The nearest tide station, Fortaleza, is 4.1 mi to the east.
- Its coast faces north.
- Beaches and harbors nearby: Praia Formosa (0.3 mi), Praia de Pirambu (1.1 mi), Praia de Iracema (2.4 mi), Praia do Meireles (3.0 mi).
Questions about FortalezaQuestions
What time is high tide today in Fortaleza?
Today in Fortaleza there are high tides at 6:30 am (7.3 ft) and 6:46 pm (7.9 ft) and low tides at 12:13 am and 12:23 pm. Tide coefficient 86.
What time is sunset today in Fortaleza?
At 5:25 pm. There is light until the end of civil twilight, at 5:46 pm.
What time is sunrise tomorrow in Fortaleza?
At 5:11 am. First light comes at 4:25 am.
What phase is the moon today?
Waning gibbous, 84% illuminated. New moon on Mon, Nov 9 · 4:03 am.
When are the next spring tides?
From November 9 to 11.
What are today's solunar periods?
Major 1:06–3:06 am, Minor 7:44–8:44 am, Major 1:39–3:39 pm, Minor 8:34–9:34 pm. Today's activity is medium.
What's the weather like today in Fortaleza?
Light drizzle, from 80 °F to 87 °F, with a gentle breeze from the east-southeast (11 mph) and a 47% chance of rain.
How is the sea today in Fortaleza?
Moderate (Douglas 4): 4.9 ft waves with a period of 6.1 s from the east-northeast. The water is 83.7 °F.
When is the best time to visit Fortaleza?
The best time to visit Fortaleza is from August to November: highs of 86 °F to 87 °F, barely 1 rainy day a month and 8 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: Fortaleza 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).