Life & fun · November 30, 2018
Harmony of the Spheres – Gravity Simulator
3D gravity and space Simulator. Explore and play around with the force of gravity in the context of an array of scenarios from our solar system and beyond. You can add planets, delete the Sun, change the value of the gravitational constant or simply lean back and enjoy the dazzling beauty of the pen
Harmony of the Spheres – Gravity Simulator launched on November 30, 2018 with 69 votes, #639 of 2,709 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 7 years on.
In plain words
Harmony of the Spheres is a 3D gravity simulator that lets users explore gravitational physics through interactive scenarios based on real solar systems and fictional setups. Users can add planets, modify gravitational constants, delete celestial bodies, or simply observe orbital mechanics in action. It's designed for anyone interested in space physics and visual demonstrations of how gravity shapes planetary motion.
written from the facts on this page · September 2026
From the sources
3D gravity and space Simulator. Explore and play around with the force of gravity in the context of an array of scenarios from our solar system and beyond. You can add planets, delete the Sun, change the value of the gravitational constant or simply lean back and enjoy the dazzling beauty of the pentagram that the orbit of Venus traces when Earth is held fixed at the center of the coordinate syste
Does a similar job
all alternatives →- GIGravity – Interactive solar-system simulator, from Newton to EinsteinJun 2026 · qunabu.github.io · ▲217
Just for fun and self education, I've built this over a weekend to teach myself why orbits exist, not just show planets going around. Something that was never clearly explain to me in school. It opens with a guided tour that builds the idea up step by step: two bodies and the equal/opposite force, inertia (the Sun is removed and Earth just drifts straight), then "an orbit is falling and continuously missing," cosmic velocities with a little rocket, Voyager 1 & 2's real gravity assists (the clock runs the actual 1977–1989 dates so the planets orbit into their grand-tour alignment and the…
Atlas of Space2025 · atlasof.space · ▲770Hello HN! Sharing a recent side project of mine, the Atlas of Space, that I built out to explore the Solar System. As a long-time space nerd, I realized recently that I didn't have a good intuition on the scale, speed, and relative orientation of the celestial bodies around us. So over the break I built out a kind of spatial Wikipedia to click around and learn about planets, moons, asteroids, and other bodies orbiting the Sun. The physics is all simulated in the browser using simple Newtonian mechanics. There's a lot left to do from here, including modeling objects in non-Keplerian orbits…
- IBI built a gravity simulator in pure CSS2022 · multiplanetary.website · ▲64
- IBI built an interactive 3D three-body problem simulator in the browserMar 2026 · structuredlabs.github.io · ▲60
Browser-based interactive 3D Three-Body problem simulatorNov 2025 · trisolarchaos.com · ▲249Features include: - Several preset periodic orbits: the classic Figure-8, plus newly discovered 3D solutions from Li and Liao's recent database of 10,000+ orbits (https://arxiv.org/html/2508.08568v1) - Full 3D camera controls (rotate/pan/zoom) with body-following mode - Force and velocity vector visualization - Timeline scrubbing to explore the full orbital period The 3D presets are particularly interesting. Try "O₂(1.2)" or "Piano O₆(0.6)" from the Load Presets menu to see configurations where bodies weave in and out of the orbital plane. Most browser…
Questions this answers
More life & fun this month
the category →
A free city-building game in your browser. You are the mayor. You know what the city needs. Now get it past the zoning board, the neighbors, the appeals court and the next election.
Life & fun · 2d ago · permit.petercai.com
- IV
Life & fun · 14d ago · tanzaniaeducationproject.org
Turn a phone, tablet or TV into a sign. Type a message and it fills the screen: welcome signs, timers, Wi-Fi passwords and more. No app, no account, free.
Life & fun · 15d ago · bigwords.page
Play a free virtual guitar online with your keyboard or by touch. Slow songs down and see every chord, string and strum. Acoustic, classic, electric and bass.
Life & fun · 9d ago · guitoro.com
Carrier settings from iPhone, Pixel and Galaxy firmware, decoded and compared: APNs, VoLTE, 5G and Wi-Fi Calling per carrier, and what each build changed.
Life & fun · 13d ago · carrierexplode.com
Life & fun · 23d ago · space.bl2.net
Source: Show HN post ↗
Launched alongside, November 2018
the whole month →
Learn how to build for the web and see where you stand 🌟
Dev tools · 2018 · web.dev
The 1.1.1.1 App▲689Faster, more private internet by Cloudflare, now on mobile
Work · 2018 · apps.apple.com
Tabnine is the AI code assistant that accelerates and simplifies software development while keeping your code private, secure, and compliant.
AI · 2018 · tabnine.com
