Sunreach

Travel · Updated

Plan a sightseeing day around the sun

Sunreach helps travelers choose when to visit a place by comparing sunlight windows for their actual travel dates. Check a few stops, then build a day that fits the light you want.

Sunreach is a 3D and AR sun tracker for iPhone and iPad, coming soon to the App Store. This guide describes the current app; planned upgrades are listed separately. Terrain coverage varies by location.

Bled Island with its church and Bled Castle on the cliff above Lake Bled, Slovenia.
Lake Bled, Slovenia. Photo: Abrget47j, CC BY-SA 3.0, via Wikimedia Commons. Resized and re-compressed.

Why plan a sightseeing day around sunlight?

A place can be in shade long after sunrise or lose the sun before sunset. Checking the sunlight window helps you decide which stops to visit first, especially beside mountains or steep terrain.

Think about the experience you want: a sunlit lakeshore, a terrace for lunch, a shaded rest stop, or a viewpoint before the last light leaves. A daylight forecast alone does not tell you when direct sun reaches your particular pin.

Sunreach is being built for photographers and travelers. You do not need camera settings to use it: choose a place and a date, then read its estimated sun-on-spot times.

How do you turn sun times into a day plan?

Check each stop separately, put stops with short sunlight windows into those windows, and fit flexible activities between them. You make the itinerary; the app supplies light information for the places you choose.

  1. Choose a few stops. Pick the actual viewpoint, terrace or lakeside position rather than relying on a town-wide sunrise time.
  2. Set your travel date. Check the destination’s local time, especially after changing time zones.
  3. Read the direct-sun window. Compare it with opening hours, walking time and your other plans.
  4. Inspect the terrain in 3D. Move the time to understand where the light comes from and when a ridge casts shade.
  5. Keep a weather alternative. A geometrically sunny window can still be cloudy.

Sunreach computes this for any spot on Earth, from the real terrain around it. Get the app ↓

Does this work outside Europe?

The app uses global terrain as its foundation, so the same place-and-date workflow is intended for trips around the world. Fine-data quality and local obstruction coverage vary by destination.

A winter valley in Europe, a mountain viewpoint in North America and a hillside stop in the southern hemisphere can all have different sunlight windows. Do not reuse one destination’s season or compass rule elsewhere. Select the actual pin and date, then inspect the source and estimated accuracy.

Additional high-resolution data by country is on the roadmap. Country support does not mean every street, tree or roof is represented.

Can Sunreach keep me in the sun all day?

It can help you choose the timing of individual stops, but it does not yet optimise a route or automatically generate a sunny-day itinerary. Terrain estimates also cannot guarantee sunshine through clouds.

Use sunlight as one planning input alongside transport, opening hours and a current local forecast. Check separate points along a long walk; a shaded start does not describe the entire trail.

For a practical example, try the Yosemite 3D demo ↗. For small structures, read what a sun planner can tell you about a hotel balcony.

Frequently asked questions

Is this only useful for photographers?

No. It can help tourists choose when to visit a viewpoint, enjoy a sunny outdoor stop or look for terrain shade, without using camera controls.

Does it book or schedule my trip?

No. You choose the stops and schedule. It estimates sun and shade at selected places; route optimisation and community discovery are not current features.

Sources

  1. Sunreach: method, definitions and estimated accuracy
  2. Sunreach: current terrain sources and coverage
  3. Sunreach: planned upgrades
  4. NOAA: solar calculation details and atmospheric uncertainty

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