Tatsugō tides today
- Tide now 4.4 ft ↓ falling · low 2:43 pm (2.9 ft)
- Best time to fish 2:00–3:40 pm good day · 8/10
- Beach day 10:00 am–3:00 pm Fair beach day · 6/10
- Waves · water 3.0 ft · 80 °F slight · 6.2 s from the northeast
- Wind · air 9 mph · 79 °F from the ESE, gusts 15 · overcast
- Surf today 1.5–2.4 ft Fair day · 4/10 · 10:00 am–2:00 pm
- Sun 6:31 am–5:39 pm 11 h 8 min of daylight
- Moon 88% · 8:04 pm waning gibbous · rises at 8:04 pm
Today in Tatsugō there are high tides at 9:09 am (6.3 ft) and 8:23 pm (6.6 ft) and low tides at 2:28 am and 2:43 pm. Tide coefficient 90. Right now the tide is falling toward the low tide at 2:43 pm. The sun rises at 6:31 am and sets at 5:39 pm: 11 h 8 min of daylight. The moon is 88% illuminated (waning gibbous) and rises at 8:04 pm. Major solunar periods run from 1:24 am to 3:24 am and from 1:56 pm to 3:56 pm. The next spring tides arrive from October 27 to 29. The sea is slight, with 3.0 ft waves. There's a gentle breeze from the east-southeast (9 mph). Overcast, 79 °F.
Fishing in Tatsugō today
Best time to fish
Solunar activity today: medium- Low tide at 2:43 pm
- Major period 1:56–3:56 pm
- Steady pressure (30.12 inHg), light offshore wind (11 mph) and some swell (2.8 ft waves) to stir the water
- Waning gibbous: a bit more activity than at the quarters
- Highest tide coefficient today: 90 (spring tides)
Your day at a glance
The best window, 2:00 pm to 3:40 pm, combines the 2:43 pm low tide, a major period and some swell. Also good from 9:20 am to 10:10 am, with the 9:09 am high tide, moonset and some swell. Also worth a try from 2:30 am to 3:20 am, with the 2:28 am low tide, a major period and some swell, though with rising pressure.
Species with the most records nearby: striped mullet, mangrove red snapper, giant trevally and bluefin trevally. What you can catch
Beach day in Tatsugō
Is it a beach day?
1 good hour- Feels like 80 °F: pleasant
- Calm for swimming: 3.2 ft waves
- UV 5 (moderate): SPF 30 sunscreen
- Water at 80 °F (warm)
- Low tide at 2:43 pm: more sand
- Cloudy (79% cloud cover)
Today, hour by hour
- Swimming Calm · 3.2 ft
3.2 ft waves: calm for swimming. Low rip current risk. Always follow the lifeguard's flags.
- Water 80 °F
Warm: very pleasant.
- Sun & sunscreen UV 5 · SPF 30
Max UV 5 (moderate): SPF 30 sunscreen, reapplied every 2 hours.
- Wind 12 mph
Offshore breeze (12 mph). Watch floats and inflatables: offshore wind carries them out to sea.
- Tide & sand 2:43 pm
Low tide at 2:28 am and 2:43 pm: that's when there's the most sand. High tide at 9:09 am and 8:23 pm. Coefficient 90 (spring tides): little sand left at high tide.
The best window, 10:00 am to 3:00 pm, brings pleasant temperatures, a calm sea, water at 80 °F and low tide at 2:43 pm, though with clouds and light offshore wind.
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 Tatsugō
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- 鯨浜海岸 3.1 mi · E
- 打田原海岸 3.2 mi · E
- Restrooms
- Parking
- 崎原海岸 3.2 mi · E
- Restrooms
- 手広海岸 3.5 mi · S
- Restrooms
- Parking
- 用安海岸 4.3 mi · SE
- Parking
- 赤木名海岸 4.4 mi · E
- Parking
- 土浜海岸 5.3 mi · SE
- 節田海岸 5.9 mi · SE
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 Tatsugō
Webcams provided by windy.com — add a webcam
Tides in Tatsugō
Today's high and low tides
- ▼ Low tide 2:28 am 0.0 ft
- ▲ High tide 9:09 am 6.3 ft · coef. 90
- ▼ Next low tide 2:43 pm 2.9 ft
- ▲ High tide 8:23 pm 6.6 ft · coef. 84
↓ Falling The tide is falling. 2 h 35 min to low tide at 2:43 pm.
Tide coefficient 90 for the 9:09 am high tide and 84 for the 8:23 pm high tide. Spring tides. The water rises and falls 6.6 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 August 14 (7.5 ft) and the lowest, on December 25 (-1.1 ft).
Mixed: two high and two low tides a day, but of quite different heights.
Heights above NLLW. Astronomical prediction: wind and air pressure can raise or lower the water by a few inches, and more in a storm. Not for navigation. NLLW
Tide coefficient and range in October
The biggest tides of the month came from October 26 to 27 (coefficient 104, 6.8 ft range). The smallest, on October 19 (coefficient 22, 2.3 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 | 6:31 am · 5:39 pm | Low tide 2:28 am · 0.0 ft | High tide 9:09 am · 6.3 ft | Low tide 2:43 pm · 2.9 ft | High tide 8:23 pm · 6.6 ft | Coef. 90 | 88% | Major periods 1:24 am · 1:56 pm | Medium |
| Fri 30 | 6:32 am · 5:39 pm | Low tide 3:14 am · 0.2 ft | High tide 10:01 am · 5.9 ft | Low tide 3:28 pm · 3.3 ft | High tide 9:05 pm · 6.2 ft | Coef. 76 | 80% | Major periods 2:28 am · 3:01 pm | Medium |
| Sat 31 | 6:32 am · 5:38 pm | Low tide 4:06 am · 0.7 ft | High tide 11:05 am · 5.5 ft | Low tide 4:26 pm · 3.6 ft | High tide 9:57 pm · 5.7 ft | Coef. 61 | 69% | Major periods 3:32 am · 4:03 pm | Medium |
| Sun 1 | 6:33 am · 5:37 pm | Low tide 5:10 am · 1.2 ft | High tide 12:27 pm · 5.2 ft | Low tide 5:54 pm · 3.8 ft | High tide 11:11 pm · 5.2 ft | Coef. 47 | 58% | Major periods 4:33 am · 5:01 pm | Medium |
| Mon 2 | 6:34 am · 5:36 pm | Low tide 6:30 am · 1.7 ft | High tide 1:56 pm · 5.2 ft | Low tide 7:43 pm · 3.5 ft | — | Coef. 41 | Last quarter | Major periods 5:28 am · 5:54 pm | Medium |
| Tue 3 | 6:34 am · 5:35 pm | High tide 1:01 am · 4.9 ft | Low tide 8:00 am · 1.9 ft | High tide 3:04 pm · 5.4 ft | Low tide 9:07 pm · 3.0 ft | Coef. 46 | 36% | Major periods 6:19 am · 6:43 pm | Medium |
| Wed 4 | 6:35 am · 5:35 pm | High tide 2:47 am · 5.0 ft | Low tide 9:16 am · 2.0 ft | High tide 3:52 pm · 5.7 ft | Low tide 10:05 pm · 2.3 ft | Coef. 57 | 26% | Major periods 7:07 am · 7:29 pm | Low |
▲ high tide · ▼ low tide · heights above NLLW. Major periods: start time; they last 2 hours. Activity: based on the moon phase and the solunar periods.
Where this tide comes from
Tatsugō has no station of its own, so we use the tide at Naze (Japan Coast Guard), 7.1 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: Japan Coast Guard, Hydrographic and Oceanographic Department, https://www1.kaiho.mlit.go.jp/TIDE/gauge/index_eng.php. Edited by Open Waters: constituent names, units and phases converted; tidal datums derived. Licensed Government Standard Terms of Use 2.0 (https://www1.kaiho.mlit.go.jp/copyright.html). Modified: see https://github.com/openwatersio/slackwater-database#modifications-to-source-data
The sea at Tatsugō
Sea stateSea state: slight
The waves you may find
- Most commonMost common1.5 ft
- Significant3.0 ft
- Highest expectedHighest6.2 ft
One wave in seven is higher than the significant height, and about 3 times a day one reaches 6.2 ft. Before heading out, expect waves of up to 6.2 ft.
Wind on the coast and offshore
The model doesn't separate offshore wind here: it's the same as on the coast.
Cross-offshore wind. The coast faces north and the wind comes off the land at an angle: calmer water near the shore, and bait and boats drift out to sea.
Wave height, next 7 daysWaves, next 7 days
Waves stay much the same all week. The biggest waves arrive on Wednesday 4: 4.7 ft with a period of 8 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 (+1.8 °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 12:08 pm (local time).
Surf in Tatsugō today
Surf today
Fair- 1.8–2.7 ft surf at the shore, a fun size for most surfers
- 2.3 ft swell at 6 s from the north-northwest, short: weak, messy waves
- Light offshore wind (9 mph): it holds up and grooms the waves
- First or last light of the day
- Rising tide (high tide at 9:09 am)
- Light: First light 6:07 am · sunrise 6:31 am · sunset 5:39 pm · last light 6:04 pm
- Tide: low 2:28 am (-0.0 ft), high 9:09 am (6.3 ft), low 2:43 pm (2.9 ft) and high 8:23 pm (6.6 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 79.9 °F: boardshorts or a swimsuit and a rash guard.
- Energy: 36 kJ · Low power
Today’s surf at a glance
The best window, 6:07 am to 9:00 am, has a good size and light offshore wind, though with a short-period swell. 10:00 am to 2:00 pm can also work, with light offshore wind, though with 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 Tatsugō today
Diving and snorkeling today
Likely visibility: fair- Slack water around low tide (2:43 pm): little current from 2:10 pm to 3:10 pm
- 1.9 ft swell at 5 s from the northeast: some surge on the bottom
- Light offshore wind (11 mph)
- 0.2 mph current toward the northeast, weak (model)
- Sun high: more light underwater
- Slack water today: low tide 2:28 am (2:10–2:50 am), high tide 9:09 am (8:50–9:30 am), low tide 2:43 pm (2:10–3:10 pm) and high tide 8:23 pm (8:00–8:50 pm)
- Likely visibility: fair. Swell (up to 6.6 ft at 7 s) over the last few days has stirred up the water. Based on the last 24 hours of data.
- Water at 79.9 °F: a shorty or a rash guard.
- Snorkeling: doable, with some waves or wind.
- Night dive: dark from 6:04 pm. Waning gibbous (88%), rising at 8:04 pm: a bright night.
Your diving day at a glance
The best window, 1:30 pm to 3:40 pm, combines slack water at low tide, light wind, weak current and the sun high. Also good from 8:30 am to 10:10 am, with slack water at high tide, 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
- 奄美大島ダイビングショップ ルプラ 0.4 mi
- リラックス ダイビング サービス 1.9 mi
- ダイビングショップネイティブシー奄美 1.9 mi
- あまみこダイバー 5.0 mi
- エンドレスブルー奄美大島 5.8 mi
- ダイビングショップネバーランド 6.5 mi
- ひかるダイバーズ 6.7 mi
- ダイビングサービスフリッパー 6.7 mi
- マリンスポーツ奄美 7.2 mi
- AquaDiveKohollo 7.6 mi
- Leap Scuba Amami 7.8 mi
- ダイビングショップエンドレスブルー 7.9 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
Sites: © OpenStreetMap contributors (ODbL).
Weather in Tatsugō
Now in Tatsugō
- Low / high
- 74 / 79 °F
- Rain
- 0.00 in · 0%
- Clouds
- 96%
- Humidity
- 55%
- Dew pointDew point
- 61 °F
- Visibility
- 15 mi
- UV indexUV
- 5 · moderate
- Air qualityAir
- Fair · 40
- 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 (−0.02 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 | Mainly clear | Mainly clear | Partly cloudy | Mainly clear | Overcast | Overcast | Overcast | Mainly clear |
| Temperature | 75° | 74° | 75° | 76° | 79° | 78° | 77° | 77° |
| Wind (mph) | 13 E | 12 E | 8 ESE | 12 ESE | 9 ESE | 10 ESE | 10 SE | 8 SE |
| Gusts | 19 | 19 | 15 | 17 | 15 | 14 | 14 | 14 |
| Waves | 4.3 ft | 3.9 ft | 3.6 ft | 3.3 ft | 3.0 ft | 2.8 ft | 2.6 ft | 2.5 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 pm 79° 9 ESE 3.0 ft
- 3:00 pm 78° 10 ESE 2.8 ft
- 6:00 pm 77° 10 SE 2.6 ft
- 9:00 pm 77° 8 SE 2.5 ft
- 12:00 am 77° 9 SE 2.4 ft
- 3:00 am 77° 5 E 2.3 ft
- 6:00 am 75° 5 S 2.2 ft
- 9:00 am 74° 5 S 2.2 ft
Next 14 daysComing days
| Day | Sky | Low / high | Max wind | Max wave | High tides |
|---|---|---|---|---|---|
| Today · 29 | 74 / 79 °F | 13 mph ESE | 4.3 ft | 9:09 am · 8:23 pm | |
| Fri 30 | 74 / 78 °F | 14 mph NNW | 2.4 ft | 10:01 am · 9:05 pm | |
| Sat 31 | 73 / 76 °F | 16 mph N | 3.3 ft | 11:05 am · 9:57 pm | |
| Sun 1 | 72 / 76 °F | 10 mph SE | 3.1 ft | 12:27 pm · 11:11 pm | |
| Mon 2 | 74 / 79 °F | 14 mph W | 3.3 ft | 1:56 pm | |
| Tue 3 | 74 / 78 °F | 18 mph NNE | 4.5 ft | 1:01 am · 3:04 pm | |
| Wed 4 | 74 / 78 °F | 20 mph ENE | 4.7 ft | 2:47 am · 3:52 pm | |
| Thu 5 | 76 / 78 °F | 16 mph NE | 4.3 ft | 4:03 am · 4:31 pm | |
| Fri 6 | 73 / 76 °F | 21 mph NNE | 4.7 ft | 4:59 am · 5:05 pm | |
| Sat 7 | 73 / 75 °F | 20 mph ENE | 7.2 ft | 5:46 am · 5:36 pm | |
| Sun 8 | 73 / 76 °F | 20 mph ENE | 5.8 ft | 6:27 am · 6:05 pm | |
| Mon 9 | 68 / 73 °F | 23 mph N | 9.8 ft | 7:04 am · 6:33 pm | |
| Tue 10 | 67 / 69 °F | 17 mph N | 8.5 ft | 7:39 am · 7:01 pm | |
| Wed 11 | 68 / 71 °F | 16 mph NNE | 6.2 ft | 8:13 am · 7:29 pm |
- Fri 30 Heavy drizzle 74° / 78° 2.4 ft
- Sat 31 Partly cloudy 73° / 76° 3.3 ft
- Sun 1 Mainly clear 72° / 76° 3.1 ft
- Mon 2 Drizzle 74° / 79° 3.3 ft
- Tue 3 Light drizzle 74° / 78° 4.5 ft
- Wed 4 Light drizzle 74° / 78° 4.7 ft
- Thu 5 Light drizzle 76° / 78° 4.3 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 (77 °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 12:08 pm (local time).
The sun in Tatsugō
Sunrise and sunset
- First light 5:39 am
- Full dark 6:31 pm
- Civil dawn 6:07 am
- Civil dusk 6:04 pm
- Solar noon 12:05 pm (48° high)
- Daylight 11 h 8 min (−2 min)
- Evening golden hour 5:07 pm
- Full dark 6:31 pm
Golden hour and the day-night map
Today the sun is 92,344,269 mi away and looks 32′ 11″ across.
The moon in Tatsugō
Moon phase and position
Today the moon is 226,480 mi away and looks 32′ 46″ across.
Solunar periods
Today's activity: medium- 1:24–3:24 am Major · the moon passes overhead · high activity
- 1:56–3:56 pm Major · the moon passes underfoot · high activity
- 9:17–10:17 am Minor · moonset · medium activity
- 7:34–8:34 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 Mon, Nov 2 · 5:29 amNov 2 in 4 days
- New moon Mon, Nov 9 · 4:03 pmNov 9 in 11 days
- First quarter Tue, Nov 17 · 8:48 pmNov 17 in 19 days
- Full moon Tue, Nov 24 · 11:54 pmNov 24 in 26 days
Perigee on October 29, 226,426 mi away, coinciding with the spring tides from October 27 to 29: they will be stronger than usual.
Where to fish in Tatsugō
Piers, ramps and tackle shops nearby
Map: OpenFreeMap · © OpenMapTiles · © OpenStreetMap contributors
- Jetty 2.4 mi
- Jetty 3.7 mi
- Jetty 5.9 mi
- Jetty 6.4 mi
- Jetty 6.4 mi
- Jetty 6.4 mi
- Jetty 6.5 mi
- Jetty 6.7 mi
- Boat ramp 2.3 mi
- Boat ramp 2.5 mi
- Boat ramp 6.5 mi
- spearfishing The Thinking Palm 1.9 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 0.25 mi from shore. It reaches 164 ft at 0.4 mi.
From the shoreline (1.5 mi from Tatsugō) out to sea, heading north.
How far from shore
- 16 ft deep1,250 ft
- 33 ft deep0.25 mi
- 66 ft deep0.3 mi
- 164 ft deep0.4 mi
For fishing, swimming and diving
- Shore fishing. 33 ft of water just 0.25 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 0.25 mi and 66 ft at 0.3 mi from shore.
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
Borose Saki Lighthouse 4.7 mi west
- Light
- A long white flash every 10 s · LFl W 10s
- Range
- 6 nautical miles (6.3 mi)
- Light height
- 374 ft above sea level
- Tower height
- 36 ft
- Built
- 1912
Data from Wikidata. For reference only: not for navigation. Wikidata · Sources and licenses
Tides near TatsugōTides nearby
All places in Kagoshima, A to Z (301) →Tatsugō at a glance
- Town or city of about 5,992 people. Coordinates: 28.450° N, 129.600° E.
- It is 223 mi south of Kagoshima, the main place in Kagoshima. The sun rises at the same time and sets 8 min later than in Kagoshima.
- The nearest tide station, Naze, is 7.1 mi to the southwest.
- Its coast faces north.
- Beaches and harbors nearby: Tatsugo Kō (1.1 mi), En Kō (1.5 mi), Ashitoku Kō (2.5 mi), Akakina Kō (4.4 mi).
Questions about TatsugōQuestions
What time is high tide today in Tatsugō?
Today in Tatsugō there are high tides at 9:09 am (6.3 ft) and 8:23 pm (6.6 ft) and low tides at 2:28 am and 2:43 pm. Tide coefficient 90.
What time is sunset today in Tatsugō?
At 5:39 pm. There is light until the end of civil twilight, at 6:04 pm.
What time is sunrise tomorrow in Tatsugō?
At 6:32 am. First light comes at 5:40 am.
What phase is the moon today?
Waning gibbous, 88% illuminated. New moon on Mon, Nov 9 · 4:03 pm.
When are the next spring tides?
From October 27 to 29, together with the lunar perigee: they will be stronger than usual.
What are today's solunar periods?
Major 1:24–3:24 am, Minor 9:17–10:17 am, Major 1:56–3:56 pm, Minor 7:34–8:34 pm. Today's activity is medium.
What's the weather like today in Tatsugō?
Overcast, from 74 °F to 79 °F, with a gentle breeze from the east-southeast (9 mph) and a 0% chance of rain.
How is the sea today in Tatsugō?
Slight (Douglas 3): 3.0 ft waves with a period of 6.2 s from the northeast. The water is 79.9 °F.
When is the best time to visit Tatsugō?
The best time to visit Tatsugō is from July to November and from April to May: highs of 72 °F to 88 °F, about 13 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: Naze station of the Hydrographic and Oceanographic Department of the Japan Coast Guard. 出典：海上保安庁ホームページ, under the Government of Japan Standard Terms of Use 2.0; harmonic constants adapted by Open Waters, via Slackwater database (changes) (海上保安庁海洋情報部「潮汐調和定数」を加工して作成). Not an official Japan Coast Guard publication. Sun and moon: our own calculation with astronomy-engine. Places: GeoNames (CC BY 4.0). Coastline: © OpenStreetMap contributors (ODbL).