January 3, 2026

When the Moon hits your terminal

Show HN: The ASCII Side of the Moon

Retro Moon Magic: a text-art lunar show has the olds nostalgic and the young swooning

TLDR: A quirky app renders the Moon in charming text art while accurately showing its phases, wobble, and size, and it runs from a simple link or command. Comments overflowed with nostalgia and light debate over “useful vs delightful,” with most celebrating retro fun meeting real astronomy.

The internet is howling at The ASCII Side of the Moon, a quirky little site from aleyan.com that turns the Moon into old-school text art—and the comments are the real show. The app doesn’t just doodle; it accurately shows lunar phases, wobble, and size changes as the Moon moves, and even flips depending on where you are on Earth. It runs in your browser, via a simple web link, or from your terminal with a one-liner. That blend of retro vibes and real astronomy had veterans misty-eyed and newbies giddy.

Nostalgia hit hard. One commenter recalled 80s Sun workstation screens, and a wave of “screen saver energy” washed in. The mood: wholesome chaos. People imagine setting it as their daily login greeting or timing night hikes with a text-based Moon. Cue jokes about werewolves checking full moons with curl and “waning productivity” during lunar phases. A gentle scuffle emerged over usefulness—minimalists asked “why?” while others fired back with “because it’s delightful.” Terminal purists praised the no-frills npx install, while star-gazers loved that the phases and “lunar wobble” aren’t just for show—they’re real. In a rare plot twist for the internet, the crowd mostly united around one feeling: tech can be both nerdy and joyful.

Key Points

  • Interactive tool renders the Moon in 7-bit ASCII with accurate lunar phase visualization.
  • Calculates and displays Earth–Moon distance effects on apparent size (up to ~12% variation).
  • Includes lunar libration and orientation changes based on observer location and time.
  • Users can fetch ASCII output via curl with date, latitude/longitude, and celestial frame parameters.
  • MIT-licensed npm package available on GitHub; relies on astronomy-engine and uses Blender-rendered assets.

Hottest takes

“Fond memories of Sun workstations in the 80’s” — yodon
Made with <3 by @siedrix and @shesho from CDMX. Powered by Forge&Hive.