Privacy Policy

Effective 15 August 2026 · Covers Meridian for iPhone and Meridian for Android

Meridian is an app about daylight. To tell you when the Sun rises where you are, it has to know roughly where you are. This page says exactly what it does with that, and what it never does.

The short version

• There is no Meridian server. Nothing you do in the app reaches me, ever.
• No account, no sign-in, and no identifier of any kind.
• No analytics, no crash reporting, no advertising, no tracking, and no third-party SDKs that do any of those things.
• Your location stays on your phone. Two things leave it, both described below, and neither is stored anywhere by me.

What Meridian does with your location

With your permission, Meridian reads your device's position and uses it to work out your sunrise, sunset, twilights, the Sun's height and direction, the Moon's phase and rise and set, and the shape of your year. All of that arithmetic happens on your phone. No part of it is sent anywhere.

The thirty-year cloud record on the This Place screen is the same: that data ships inside the app and is read from local storage. Looking at it makes no network request at all.

Location is optional. Decline it and the app still works — it opens on a default sky, and you can search for any place you like.

Places you save, the skies you star, and the last position the app resolved are kept in your device's own app storage. They are removed when you delete the app. They are never uploaded.

What leaves your device

Two things, and only two. They differ between the platforms, so they are listed separately.

On iPhone

• The weather forecast is requested from Apple WeatherKit, using your coordinate.
• Naming a place — turning a coordinate into a suburb, or finding a city you have typed — uses Apple's geocoding service through the operating system.

Both are Apple services, governed by Apple's privacy policy. Apple states that WeatherKit location data is not used to identify you or build a profile.

On Android

• The weather forecast is requested from Open-Meteo, an independent open weather service. Your coordinate is rounded to about one kilometre before the request is made. Forecast models work at a resolution of several kilometres, so this changes nothing about the answer — it simply means the request describes a neighbourhood rather than an address. Open-Meteo receives no identifier, and there is no account or API key attached to the request.
• Naming a place uses Android's geocoder, which on most devices is provided by Google. This lookup needs your true position — an approximate one would name the wrong suburb — so it is not rounded. It runs only when your place actually changes, not continuously.

Android obtains the position itself through the operating system's location services. What Google's own location services collect is governed by Google's privacy policy and by your device settings, and is outside Meridian's control.

Why the two differ

On iPhone the forecast goes to Apple, who already hold your device's position; rounding it would withhold nothing from anyone. On Android the forecast goes to an unrelated third party, so the coordinate is coarsened first. The difference is deliberate.

Notifications

Sunrise and sunset alerts, if you turn them on, are scheduled and delivered entirely on your device. There is no push server, no token, and no message that travels over a network. Your phone works out the times itself and sets its own alarms.

Widgets

Widgets read the place already saved on your device and compute what they show locally. They make no network request of their own.

What Meridian never collects

• Your name, email address, phone number or contacts
• Any account, login, or user identifier
• Advertising identifiers, or any data used for advertising
• Analytics, usage statistics, or behavioural data
• Crash reports containing your data
• Photos, files, calendar, health data or anything else on your device

Because none of it is collected, there is nothing of yours for me to sell, share, lose, or hand over. There is no database to breach.

Children

Meridian is not directed at children and collects nothing from anyone, including children.

Your rights

Rights of access, correction, deletion and portability all attach to personal information held by an organisation. I hold none: no data about you reaches me, so there is nothing to disclose, correct, export or erase on request. The coordinates and saved places on your device are yours — remove them by deleting a saved sky, revoking the location permission in system settings, or deleting the app.

Third-party services

• Apple WeatherKit and Apple geocoding (iPhone) — see Apple's privacy policy.
• Open-Meteo (Android) — see Open-Meteo's terms.
• Google Play services (Android) — geocoding and location, see Google's privacy policy.

Climate data is derived from ERA5, generated using Copernicus Climate Change Service information and redistributed by Open-Meteo under CC-BY-4.0. It ships inside the app; using it sends nothing.

Changes

If what the apps do with data changes, this page changes with it and the effective date above moves. Meaningful changes will be noted in the app's release notes rather than made quietly.

Contact

Questions about this policy, or about anything above — email meridiansupport@jeunj.com.