The sky, computed for exactly where you are.

Sun, moon, twilight, irradiance and tides for any point on Earth — with elevation as a first-class input, not an afterthought.

Sun altitude Height above the horizon, in degrees. Crossing 0° is sunrise and sunset. peak 33.7°

Daylight
Civil
Nautical
Astronomical
Night

Clear-sky irradiance Energy landing on a horizontal surface under a cloudless sky, in W/m². peak 549 W/m²

Tide height Metres above and below mean sea level — not chart datum. range 3.56 m

07:23 Sunrise 13:15 Solar noon 19:05 Sunset Dublin, Ireland · 53.3498, -6.2603 at 20 m · Europe/Dublin · Home. Mid-latitude, modest tides.

Sun altitude Height above the horizon, in degrees. Crossing 0° is sunrise and sunset. peak 35.6°

Daylight
Civil
Nautical
Astronomical
Night

Clear-sky irradiance Energy landing on a horizontal surface under a cloudless sky, in W/m². peak 579 W/m²

Tide height Metres above and below mean sea level — not chart datum. range 10.73 m

07:09 Sunrise 13:01 Solar noon 18:52 Sunset Bristol Channel, United Kingdom · 51.4995, -2.7 at 11 m · Europe/London · One of the largest tidal ranges on Earth.

Sun altitude Height above the horizon, in degrees. Crossing 0° is sunrise and sunset. peak 17.4°

Daylight
Civil
Nautical
Astronomical
Night

Clear-sky irradiance Energy landing on a horizontal surface under a cloudless sky, in W/m². peak 264 W/m²

Tide height Metres above and below mean sea level — not chart datum. range 2.76 m

06:52 Sunrise 12:34 Solar noon 18:14 Sunset Tromsø, Norway · 69.6492, 18.9553 at 10 m · Europe/Oslo · Inside the Arctic Circle — the sun barely sets in summer.

Sun altitude Height above the horizon, in degrees. Crossing 0° is sunrise and sunset. peak 59.0°

Daylight
Civil
Nautical
Astronomical
Night

Clear-sky irradiance Energy landing on a horizontal surface under a cloudless sky, in W/m². peak 898 W/m²

Tide height Metres above and below mean sea level — not chart datum. range 1.37 m

06:26 Sunrise 12:36 Solar noon 18:47 Sunset Cape Town, South Africa · -33.9249, 18.4241 at 25 m · Africa/Johannesburg · Southern hemisphere — opposite season, same call.

Sun altitude Height above the horizon, in degrees. Crossing 0° is sunrise and sunset. peak 85.6°

Daylight
Civil
Nautical
Astronomical
Night

Clear-sky irradiance Energy landing on a horizontal surface under a cloudless sky, in W/m². peak 1063 W/m²

Tide height Metres above and below mean sea level — not chart datum. range 2.84 m

06:52 Sunrise 12:55 Solar noon 18:57 Sunset Singapore, Singapore · 1.3521, 103.8198 at 15 m · Asia/Singapore · Equatorial — near-identical day length all year.

All three computed today by /v1/ephemerides, /v1/solar and /v1/tides.

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Available APIs

Ephemerides

Sun and moon rise/set times for any latitude, longitude, AND elevation on Earth — elevation correction is unique among ephemerides APIs. Includes twilight phases, transit times, and lunar phase.

Ephemerides documentation →

Precision solar geometry and clear-sky irradiance for any location on Earth. Solar position (azimuth/altitude/zenith), Direct, Diffuse and Global Horizontal Irradiance under clear-sky conditions, and Daily Light Integral for agriculture. Backed by NREL SPA-equivalent computation (JPL DE421) and the Bird Clear Sky Model, with elevation as a first-class input.

Solar documentation →

Tides

Astronomical tide heights, high/low waters, harmonic constituents and combined tide+sun/moon windows for any coastal point on Earth, computed from the FES2022 global tide atlas. Any date, past or future.

Tides documentation →

Built for these use cases

Same APIs, sharp packaging for the buyers who need them most.

Photography

Golden hour, blue hour, sunrise / sunset — accurate at altitude, season-ahead horizon.

Explore /photo →

Prayer times

Five prayers, every major calculation school. Mountain-aware. Selectable Asr method.

Explore /prayer-times →

Marine

Civil + nautical twilight, first / last light, moon phase + altitude for tide planning.

Explore /marine →

Coastal & tides

Tide heights + high/low waters for any coastline on Earth (FES2022) — with sun and moon in the same call.

Explore /coastal →

See all use cases (smart home, agriculture, PV monitoring, EV charging, …) →

Why thirdtrail

Predictable pricing

Flat monthly tiers from €6. No surprise bills, no per-call markups, no compulsory annual commitments.

Free tier with real value

100 calls a day on every API, forever, with no card. Upgrade only when traffic warrants it.

Built for developers

Hashed API keys, granular per-key usage stats, daily/weekly/monthly caps, generous burst budgets. Simple REST — no SDK required.

Built for agents too

An MCP server and a published OpenAPI schema, so Claude, Cursor or your own agent can call these APIs correctly without you writing an integration. Paid plans.

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30-second integration

Create a free account — takes about 30 seconds.
Subscribe to an API plan from your dashboard (Free is one click).
Generate an API key — it's shown once; store it in your secret manager.
Call any endpoint with Authorization: Bearer <your_key>.

Request

curl -H "Authorization: Bearer tt_live_xxxxx" \
  "https://thirdtrail.life/v1/ephemerides/?lat=53.3498&lon=-6.2603"

Response · today, live

{
  "timezone": "Europe/Dublin",
  "days": [
    {
      "date": "2026-09-29",
      "sun": {
        "rise": "2026-09-29T07:23:47+01:00",
        "transit": "2026-09-29T13:15:20+01:00",
        "set": "2026-09-29T19:05:53+01:00"
      },
      "moon": {
        "rise": "2026-09-29T19:34:28+01:00",
        "set": "2026-09-29T11:16:52+01:00",
        "phase": {
          "name": "Waning Gibbous",
          "illumination": 0.9064
        }
      }
    }
  ]
}

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