The northern stars wheeling round the pole at the true sidereal rate – read local star time where the meridian marker crosses the turning ring of hours.
The northern stars wheeling round the pole at the true sidereal rate – read local star time where the meridian marker crosses the turning ring of hours.
In the app you can choose the colours and stars, and turn the times on or off. It runs natively on your Mac, drawn live in real time – no video, never quite the same twice.
Use it on your Mac
- Get SCRNSVRS free from the Mac App Store.
- Select Sidereal Sky in the library.
- Click Set as Screensaver or Set as Wallpaper – or both.
Free · macOS Tahoe 26 or laterNeed a hand? Read the setup guide.
Sidereal Sky FAQ
How do I set Sidereal Sky as my screensaver on a Mac?
Install SCRNSVRS free from the Mac App Store, select Sidereal Sky in the library and click Set as Screensaver. macOS starts it whenever your Mac is idle, exactly like a built-in screensaver.
Can I use Sidereal Sky as a live wallpaper?
Yes. Click Set as Wallpaper in SCRNSVRS and Sidereal Sky plays on your desktop behind your windows and icons. You can use it as screensaver and wallpaper at the same time.
Is Sidereal Sky free?
Yes. Sidereal Sky is Free Forever in SCRNSVRS – no account, no ads, no subscription.
Is Sidereal Sky a video loop?
No. Sidereal Sky is rendered live on your Mac with Metal, so it never repeats and stays sharp on any display size. The clip on this page is a screen recording of the real thing.
Will Sidereal Sky slow down my Mac or drain the battery?
No. SCRNSVRS drops to 30 fps on battery and stops rendering when the wallpaper is covered by a full-screen app, so Sidereal Sky costs next to nothing in everyday use.
Which Macs does Sidereal Sky run on?
Sidereal Sky needs macOS Tahoe 26 or later.
