Privacy

Last updated October 13, 2026

Moon Data is a personal project. It has no ads and no analytics, and it never sells or shares data. You don't need an account to use it; a few private sections are open only to people Isabel has invited. Here is exactly what happens to information on this site.

Moon and planet tools

When you enter a date on the Moon Sign, Sun Sign or Planet Signs pages, the server uses it to do the calculation and sends back the result. The date you enter isn't saved.

Birth Chart

  • Your birth date, time and place are used only to calculate your chart. They aren't saved, logged or shared.
  • When you search for your birthplace, the text you type is sent from this site's server to Open-Meteo's free city search to find matching places. Your IP address and birth details are never sent to them.

Band Name Generator

  • When a band name is checked, the name is sent from this site's server to MusicBrainz to look for bands and songs that use it. Your IP address isn't sent to them. Results are kept in the server's memory for up to a day so the same name isn't looked up twice, and aren't linked to you.
  • When a name turns out to belong to a real band, the site adds it to its own list of taken names (just the name and the band's public MusicBrainz details) so it isn't suggested or looked up again. Nothing about you is saved with it.
  • To limit abuse, the server briefly keeps your IP address in memory to count lookups per minute. It is never written to a file or database.
  • Names you star are saved only in your browser on your device.

Moon Journal

  • Your journal entries (mood, energy, tags and notes) are stored only in your browser on your device. They are never uploaded to this site.
  • Because they live in your browser, anyone who uses the same browser profile on your device could see them, and clearing your browser data deletes them.
  • You can export a backup file, import it again, or delete everything from the journal's Privacy & data page.
  • If you install the journal as an app, your browser also keeps a copy of the app's files so it works offline. This copy contains no journal entries.

Moon Pulse (optional, off by default)

If you turn on anonymous sharing in the journal, then once a day is over (the next time you open the journal) it sends this site three things from that day's last entry, at most once a day:

  • the date,
  • your mood rating (1–5), and
  • your energy rating (1–5).

Nothing else is sent: no name, account, notes, tags, time of day or device ID. The database stores only those three values. To limit spam, the server briefly keeps your IP address in memory to count how often it has received ratings from it in the past hour; the IP address is never written to the database or any file.

The Moon Pulse page shows averages only, and a moon phase stays hidden until it has at least 10 ratings, so no single person's answer can be picked out. Because shared ratings aren't linked to you in any way, they can't be found or deleted individually later. You can turn sharing off at any time, and nothing more will be sent.

Member accounts (invitation only)

  • If Isabel has given you an account, the site stores your email address, a scrambled (hashed) version of your password that can't be turned back into the password, your role, and a count of failed sign-in attempts used to lock out password guessing for 15 minutes.
  • In Python Practice, the site saves which exercises you've finished and the code you finished them with, so your progress is there next time.
  • This is stored in the site's own database on Azure and isn't shared with anyone. Isabel can see members' emails and progress. Ask her to remove your account and everything stored with it at any time.

Cookies and browser storage

  • If you sign in, a sign-in cookie keeps you signed in (for the visit, or for up to 14 days if you tick "Keep me signed in"). It's removed when you sign out. Visitors who don't sign in never get it.
  • The calculator forms use a security cookie that protects them from being submitted by other websites. It doesn't track you and isn't used for anything else.
  • The Moon Journal uses your browser's local storage for your entries and settings, and the Band Name Generator uses it for your shortlist, as described above.
  • There are no advertising, analytics or tracking cookies.

Services this site relies on

  • Open-Meteo powers the birthplace search on the Birth Chart page, using place data from GeoNames. Only the search text is sent to them.
  • MusicBrainz answers the band and song lookups on the Band Name Generator. Only the name being checked is sent to them.
  • Buy Me a Coffee: the "buy me a coffee" links simply open buymeacoffee.com in a new tab. This site doesn't load anything from them, so nothing is shared unless you choose to visit.
  • Microsoft Azure hosts this site. Like nearly every web host, Azure may keep standard server logs (such as IP address, pages requested and browser type) for security and troubleshooting. This site doesn't use those logs to track or identify anyone. See Microsoft's privacy statement.

Not medical advice

Moon Journal is for curiosity and self-reflection. It isn't a medical or mental-health tool, and its charts aren't a diagnosis. If you're struggling, please reach out to a doctor or someone you trust.

Children

This site isn't directed at children under 13, and it doesn't knowingly collect information from them.

Changes

If this policy changes, the new version will be posted here with a new "last updated" date.

Contact

Questions? Email isabel@moon-data.com or visit the Contact page.