Unzip the download and double-click Orbit Clocks.saver. It then shows up in System Settings › Screen Saver.
Right-click Orbit Clocks.saver and choose Open, or allow it in System Settings › Privacy & Security.
Select the screen saver in System Settings and click Options… to pick a style, appearance, palette, typeface, retro screen and time format.
Open the Studio to tune motion, colours and retro effects, then export a standalone HTML file.
macOS 13 or later, on Apple silicon and Intel.
Yes, download and enjoy.