Every Kind of Twilight Screensaver
The Every Kind of Twilight screensaver shows the complete solar day for a city, key-less. Nautical twilight is named for when the horizon is still visible at sea; astronomical twilight is when telescopes can finally work. At high latitudes in midsummer some of these never arrive, and those rows are dropped rather than faked. It's free, runs in your browser, and ESC exits.
How the Every Kind of Twilight screensaver works
The saver reads the source described above and draws it on a canvas — no account, no tracking.
The complete solar day for a city, key-less. Nautical twilight is named for when the horizon is still visible at sea; astronomical twilight is when telescopes can finally work. At high latitudes in midsummer some of these never arrive, and those rows are dropped rather than faked.
It refreshes on a schedule, so what you see stays current.
Colours and any options can be changed in settings; nothing is stored beyond your own browser.
A worked example
The complete solar day for a city, key-less. Nautical twilight is named for when the horizon is still visible at sea; astronomical twilight is when telescopes can finally work. At high latitudes in midsummer some of these never arrive, and those rows are dropped rather than faked.
Settings & tips
- City changes what the saver shows.
- Accent and Background recolour the display.
- Every value on screen comes from the live source — nothing is simulated.
- Press ESC to leave fullscreen.
Frequently asked questions
- Is this real data?
- Yes — it comes from the source named on this page and is refreshed on a schedule.
- Is a key needed?
- No. This source is fully key-less.
- Is it free?
- Yes, and it runs entirely in your browser.