<rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:atom="http://www.w3.org/2005/Atom"><channel><title>Hacker News: qunabu</title><link>https://news.ycombinator.com/user?id=qunabu</link><description>Hacker News RSS</description><docs>https://hnrss.org/</docs><generator>hnrss v2.1.1</generator><lastBuildDate>Fri, 19 Jun 2026 10:57:35 +0000</lastBuildDate><atom:link href="https://hnrss.org/user?id=qunabu" rel="self" type="application/rss+xml"></atom:link><item><title><![CDATA[New comment by qunabu in "Show HN: Gravity – Interactive solar-system simulator, from Newton to Einstein"]]></title><description><![CDATA[
<p>I'm going to fix this soon. I've used elevenlabs for both narrator and music</p>
]]></description><pubDate>Mon, 15 Jun 2026 09:51:37 +0000</pubDate><link>https://news.ycombinator.com/item?id=48538963</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=48538963</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48538963</guid></item><item><title><![CDATA[New comment by qunabu in "Show HN: Gravity – Interactive solar-system simulator, from Newton to Einstein"]]></title><description><![CDATA[
<p>What I did is a straight forward model, yet it's still complex. The way to figure it out how it works by observation from earth without tools we have now it's insane. How Copernicus, Kepler, Galilei, Newton, Hubble, Einstein figure it out it just amazing.  Science deserves all the kudos!</p>
]]></description><pubDate>Wed, 10 Jun 2026 08:13:58 +0000</pubDate><link>https://news.ycombinator.com/item?id=48473111</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=48473111</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48473111</guid></item><item><title><![CDATA[New comment by qunabu in "Show HN: Gravity – Interactive solar-system simulator, from Newton to Einstein"]]></title><description><![CDATA[
<p>I though about this, I'll come in some iteration i suppose</p>
]]></description><pubDate>Wed, 10 Jun 2026 08:07:34 +0000</pubDate><link>https://news.ycombinator.com/item?id=48473060</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=48473060</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48473060</guid></item><item><title><![CDATA[New comment by qunabu in "Show HN: Gravity – Interactive solar-system simulator, from Newton to Einstein"]]></title><description><![CDATA[
<p>I've just published the first batch of patches and new features. I've learnt a lot during the process and from the comments which was one of the main goals, so I'm really happy about this process. Thanks again!</p>
]]></description><pubDate>Tue, 09 Jun 2026 20:36:30 +0000</pubDate><link>https://news.ycombinator.com/item?id=48467360</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=48467360</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48467360</guid></item><item><title><![CDATA[New comment by qunabu in "Show HN: Gravity – interactive solar-system simulator, from Newton to Einstein"]]></title><description><![CDATA[
<p>Thank you all for the comments and showing the weaknesses in the model and visualisation. I'll try to understand the issues and fix them soon.</p>
]]></description><pubDate>Tue, 09 Jun 2026 16:18:12 +0000</pubDate><link>https://news.ycombinator.com/item?id=48463106</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=48463106</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48463106</guid></item><item><title><![CDATA[New comment by qunabu in "Show HN: Gravity – interactive solar-system simulator, from Newton to Einstein"]]></title><description><![CDATA[
<p>There a toggle button to show hide description if you missed it</p>
]]></description><pubDate>Tue, 09 Jun 2026 14:08:30 +0000</pubDate><link>https://news.ycombinator.com/item?id=48461353</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=48461353</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48461353</guid></item><item><title><![CDATA[New comment by qunabu in "Show HN: Gravity – Interactive solar-system simulator, from Newton to Einstein"]]></title><description><![CDATA[
<p>Not in the sim right now — it's purely Newtonian (symplectic leapfrog, classical gravity). I show the concept on the last slide ("Einstein: gravity is curved spacetime") — a curve in space wrapping around a star/planet that pulls nearby objects into the well. The quantitative case, Mercury's ~43″/century perihelion precession, I'd add next as a 1PN correction — haven't gotten to it yet. Will try to figure it out how to show this</p>
]]></description><pubDate>Tue, 09 Jun 2026 13:52:24 +0000</pubDate><link>https://news.ycombinator.com/item?id=48461179</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=48461179</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48461179</guid></item><item><title><![CDATA[New comment by qunabu in "Show HN: Gravity – interactive solar-system simulator, from Newton to Einstein"]]></title><description><![CDATA[
<p>It should be better now</p>
]]></description><pubDate>Tue, 09 Jun 2026 13:31:56 +0000</pubDate><link>https://news.ycombinator.com/item?id=48460912</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=48460912</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48460912</guid></item><item><title><![CDATA[New comment by qunabu in "Show HN: Gravity – interactive solar-system simulator, from Newton to Einstein"]]></title><description><![CDATA[
<p>I should have mentioned that its not mobile friendly so far. I will try to fix this.</p>
]]></description><pubDate>Tue, 09 Jun 2026 13:16:48 +0000</pubDate><link>https://news.ycombinator.com/item?id=48460746</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=48460746</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48460746</guid></item><item><title><![CDATA[Show HN: Gravity – Interactive solar-system simulator, from Newton to Einstein]]></title><description><![CDATA[
<p>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 slingshots line up), and it ends on Einstein — gravity as curved spacetime, the classic rubber-sheet well.
What's real: every body uses its real radius/mass and J2000 orbital elements; positions come from solving Kepler's equation each  frame. You can toggle to an N-body mode (symplectic leapfrog) that shows live energy drift (~1e-6%) so you can see the integrator is honest. The only thing faked is scale — at true scale you can't see anything — so there's a toggle between true scale and a log-remapped "visual" scale, with physics always running in real AU.
Tech: TypeScript + Three.js + Vite, fully client-side, no backend, works offline (surface textures are generated procedurally from value-noise; only Earth uses a real image). Source: <a href="https://github.com/qunabu/Gravity" rel="nofollow">https://github.com/qunabu/Gravity</a><p>Happy to answer questions — and feedback on the physics or the explanations is very welcome. This project might be totally inaccurate in terms of real physics, this is how i do understand this on my own - i'm happy to confront this with reality</p>
<hr>
<p>Comments URL: <a href="https://news.ycombinator.com/item?id=48459837">https://news.ycombinator.com/item?id=48459837</a></p>
<p>Points: 217</p>
<p># Comments: 56</p>
]]></description><pubDate>Tue, 09 Jun 2026 11:46:40 +0000</pubDate><link>https://qunabu.github.io/Gravity/</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=48459837</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=48459837</guid></item><item><title><![CDATA[New comment by qunabu in "Retro Computer Museum"]]></title><description><![CDATA[
<p>There is a nice one in Cambridge as well <a href="https://www.computinghistory.org.uk/" rel="nofollow">https://www.computinghistory.org.uk/</a></p>
]]></description><pubDate>Wed, 17 May 2023 14:06:12 +0000</pubDate><link>https://news.ycombinator.com/item?id=35975382</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=35975382</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=35975382</guid></item><item><title><![CDATA[New comment by qunabu in "Atlassian is 20 years old and unprofitable"]]></title><description><![CDATA[
<p>> But there is no competing product (suite) that offers comparable functionality. Many companies have built entire workflows (not just development related) around Jira, and have huge knowledge bases in Confluence. Switching would come with a lot of effort.<p>Exactly. Other products comes with opinionated workflow or are much easier (and simpler) to use. Once you setup Jira way you wanted (good luck with that) and able to maintain this setup for all of your projects you're stuck with Jira forever - you won't be able to export all of your content to another software. The whole process takes ages and its a nightmare of going thought totally different UX pages, unintuitive settings, slow UI, setting up extremely expensive plugins (why till today you need to buy tempo to get basic functionality like time tracking) etc.<p>It's called vendor lock. Nobody ever got fired for buying Jira<p>Other products are not for every business, have limited settings - but are quicker, saves you time and are able to be useful since day one.<p>All of the companies are using Jira differently, even if you're familiar with this, and you have been using Jira in all you provious jobs for years you still need to have onboarding on how does Jira works in current company - as for instance I've worked with Asana in 3 totally different companies and workflow was the same.</p>
]]></description><pubDate>Thu, 30 Jun 2022 10:27:08 +0000</pubDate><link>https://news.ycombinator.com/item?id=31930651</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=31930651</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=31930651</guid></item><item><title><![CDATA[New comment by qunabu in "10 Years of Meteor"]]></title><description><![CDATA[
<p>Meteor was first ever magic web technology I've ever used. The fetching from backend that you wouldn't even see in developer tools, one code base for frontend backend, straight forward cli, developer selection between jquery/react/angular, kadira, build-in simple cordova<p>Never ever have I seen such a rich product that had everything and was easy to learn - back then their todo tutorial took less then 1 hour, after you had fully working todo app.<p>Yet too much magic was not what developers wanted, during the process you felt like loosing control over the processes you don't understand nor have access too.<p>Compering this to building a standard app back then with REST API, and backbone/angular/react frontend seems like saving tons of time, yet developers decided on the latter in most of the cases.<p>> It soon became clear that the community was splitting into two camps: those who appreciated Meteor’s clear value proposition of simplifying web development by providing an all-in-one environment, and those who wanted more openness towards the npm ecosystem to avoid being left behind by the rest of the webdev community.<p>That seems to be a case. Also lack of people that wanted to use this in production and cost of developers.<p>My last app in meteor was written in 2017, after hitting success everything died, even after adding 10x more CPU and RAM. Problem was that Mongo/Magic was sending too much data, multiplying this by few thousands users caused killing node.js server in seconds. Using Kadira profiling and 2 nights of coding problem was solved and app was running fine, both web and mobile (meteor cordova). Client was happy, same with users - it was success. After  investor came in, they decided it must be rewritten, because at that time, there were only 2 or 3 companies in Poland that knew that technology - investor decided its a bottleneck - whole thing was rewritten to Java Spring and Angular (or something similar).<p>PS. I wrote a post about the case in 2018 <a href="https://medium.com/qunabu-interactive/tuszama-case-study-meteor-js-app-7749d9eaeeda" rel="nofollow">https://medium.com/qunabu-interactive/tuszama-case-study-met...</a></p>
]]></description><pubDate>Wed, 29 Jun 2022 09:30:03 +0000</pubDate><link>https://news.ycombinator.com/item?id=31918027</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=31918027</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=31918027</guid></item><item><title><![CDATA[WelLMS first open-source headless Learning Management System (LMS)]]></title><description><![CDATA[
<p>Article URL: <a href="https://docs.wellms.io/">https://docs.wellms.io/</a></p>
<p>Comments URL: <a href="https://news.ycombinator.com/item?id=31861954">https://news.ycombinator.com/item?id=31861954</a></p>
<p>Points: 2</p>
<p># Comments: 0</p>
]]></description><pubDate>Fri, 24 Jun 2022 14:02:04 +0000</pubDate><link>https://docs.wellms.io/</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=31861954</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=31861954</guid></item><item><title><![CDATA[New comment by qunabu in "Mattermost – open-source platform for secure collaboration"]]></title><description><![CDATA[
<p>we use `jitsi` plugin and works like charm<p>out of the box you get free `jitsi` but you can attach your own instance as well</p>
]]></description><pubDate>Fri, 24 Jun 2022 10:55:06 +0000</pubDate><link>https://news.ycombinator.com/item?id=31859989</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=31859989</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=31859989</guid></item><item><title><![CDATA[New comment by qunabu in "First THINK C Program (2020)"]]></title><description><![CDATA[
<p>this is a classic functional programming that prefers expression like above instead of `if` statements.</p>
]]></description><pubDate>Mon, 16 Aug 2021 06:55:06 +0000</pubDate><link>https://news.ycombinator.com/item?id=28195600</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=28195600</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=28195600</guid></item><item><title><![CDATA[New comment by qunabu in "Google Docs will now use canvas based rendering"]]></title><description><![CDATA[
<p>You can render in canvas with JavaScript only, no  WebAssembly nor WebGL is needed.</p>
]]></description><pubDate>Wed, 12 May 2021 14:51:43 +0000</pubDate><link>https://news.ycombinator.com/item?id=27131009</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=27131009</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=27131009</guid></item><item><title><![CDATA[New comment by qunabu in "Google Docs will now use canvas based rendering"]]></title><description><![CDATA[
<p>It's like going back in time with Flash Player, There were many WYSIWYG flash based editors around 2010. The problem was it required a browser plugin but it did work much better then HTML4 at that time. For canvas rendering no plugin is needed. Even there was a feature to export SWF file to canvas.<p>There are some issues like accessibility, browser features like search or text highlighting, lazy loading etc. What HTML provides out of the box must be implemented from scratch.</p>
]]></description><pubDate>Wed, 12 May 2021 14:47:05 +0000</pubDate><link>https://news.ycombinator.com/item?id=27130950</link><dc:creator>qunabu</dc:creator><comments>https://news.ycombinator.com/item?id=27130950</comments><guid isPermaLink="false">https://news.ycombinator.com/item?id=27130950</guid></item></channel></rss>