Who runs this site
SunPosition.org is published by the owner of the sunposition.org domain, referred to below as the Administrator. The Administrator decides what this site does with the little data it handles and is, in the language of the GDPR, the controller for it.
Write about anything on this page, including any request about your data, to contact@sunposition.org. That is the only contact channel and it reaches a person, not a ticket queue.
The short version
- No account, no sign-up, no newsletter, no contact form.
- The astronomy runs in your browser. Your coordinates are not sent to this server.
- This server keeps no log of who visits: it counts requests per page and nothing else.
- Map tiles come from OpenStreetMap and place search from Nominatim, so those two see your request.
- Advertising is served by Google AdSense. In the EEA, the UK and Switzerland, Google asks before it uses cookies for ads.
- No analytics, no tracking pixels, no social network buttons.
What stays on your device
The site keeps a few things in your browser's local storage so it can pick up where you left off. They never leave your device and this server cannot read them.
| Name | What it holds | How long |
|---|---|---|
| sp.state | The pin, the date and time you were looking at, the open tab and the calculator inputs | Until you clear your browser data |
| sp.prefs | Text size, letter and line spacing, contrast and colour scheme | Until you clear your browser data |
Clearing the site data in your browser removes both. The site then behaves as it does for a first-time visitor.
What leaves your browser
Map tiles — OpenStreetMap
The map is drawn from tiles served by the OpenStreetMap Foundation. Loading a tile is an ordinary request to tile.openstreetmap.org, so their servers see your IP address, your browser identification and which part of the world you are looking at. Their terms are the tile usage policy and the OSMF privacy policy. Map data is © OpenStreetMap contributors, used under the ODbL.
Place search — Nominatim
When you type in the search box, or when the map looks up the name of the place you clicked, that text or those coordinates go to the OpenStreetMap Nominatim service. If you would rather not use it, do not search: enter coordinates directly, or use the calculator pages, which take latitude and longitude fields.
Advertising — Google AdSense
This site is funded by advertising served by Google AdSense. Every page loads Google's ad script from pagead2.googlesyndication.com, so Google sees your IP address and browser identification, as with any request.
Whether Google may also use cookies or device identifiers to choose and measure the ads is a question Google asks in its own consent window, which it shows to visitors in the European Economic Area, the United Kingdom and Switzerland. The site has no window of its own and keeps no record of your answer. If you decline, Google may still show ads, chosen from the page you are reading rather than from your past browsing.
Google acts as an independent controller for what it collects, under its own terms for partner sites. You can review or change what Google does with your data in your Google Ad Center.
Fonts, styles and scripts
Everything else the page needs comes from this domain. The typeface, the icon font, the stylesheet and the map library are served from /assets, so no font service, CDN or analytics host ever sees your visit.
Browser geolocation
The "use my location" buttons ask your browser for a position. Your browser always prompts before answering, the position is used in the page, and it is sent nowhere — unless you then let the map look up the name of that place, which is the Nominatim request above.
What this server records
One counter per address, so the Administrator can see which pages people find useful: the path and how many times it was requested. No IP address, no browser identification, no time of visit and nothing that could be tied back to a person. The counters are a plain text file on the server and are never shared.
The hosting provider may keep its own technical logs, as any web host does, for the security and reliability of the machine.
Cookies
The site itself sets no cookies for its own pages. What it uses is local storage, listed above, which is there because you asked for a setting to be remembered. Advertising cookies are Google's: in the EEA, the UK and Switzerland Google sets them only as you choose in its consent window; elsewhere Google's own policies apply.
You can change that choice at any time with the button, which also sits in the footer of every page.
Declining has no effect on anything the site does — every calculator and the map work the same either way.
The administration panel of the server uses one session cookie, but only for the Administrator after signing in. It is never sent to a visitor.
Your rights
Under the GDPR you may ask for access to your personal data, its correction or erasure, a restriction of processing, a copy in a portable form, and you may object to processing based on legitimate interest. You may also withdraw consent at any time, which for this site means changing your choice in Google's consent window, from the privacy and cookie settings button.
In practice the Administrator holds no personal data about you: there is no account, no e-mail list and the visit counters are not personal data. If you write to contact@sunposition.org, that message and your address are of course kept for as long as it takes to answer you. For what Google collects for advertising, address Google directly — the Administrator has no access to it and cannot delete it for you.
If you believe your data is handled unlawfully, you may complain to the data protection authority in the country where you live.
Children
The site is a general-purpose tool and is not directed at children. It asks for no personal data from anyone, so it collects none from children either.
Changes to this policy
If what the site does with data changes, this page changes with it and the date below moves. A change that needs your agreement — a new kind of cookie, for instance — will ask for it again rather than assume the old answer.
In force since 11 October 2026.