{"id":1337,"date":"2026-06-24T11:34:19","date_gmt":"2026-06-24T03:34:19","guid":{"rendered":"http:\/\/wp.rungobag.cn\/index.php\/2026\/06\/24\/show-hn-gravity-interactive-solar-system-simulator-from-newton-to-einstein-2\/"},"modified":"2026-06-24T11:34:19","modified_gmt":"2026-06-24T03:34:19","slug":"show-hn-gravity-interactive-solar-system-simulator-from-newton-to-einstein-2","status":"publish","type":"post","link":"https:\/\/wp.rungobag.cn\/index.php\/2026\/06\/24\/show-hn-gravity-interactive-solar-system-simulator-from-newton-to-einstein-2\/","title":{"rendered":"Show HN: Gravity \u2013 Interactive solar-system simulator, from Newton to Einstein"},"content":{"rendered":"<p>Just for fun and self education, I&#8217;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 &#8220;an orbit is falling and continuously missing,&#8221; cosmic velocities with a little rocket, Voyager 1 &#038; 2&#8217;s real gravity assists (the clock&#8230;<\/p>\n<p><a href=\"https:\/\/qunabu.github.io\/Gravity\/\">\u67e5\u770b\u539f\u6587 \u2192<\/a><\/p>\n<hr>\n<p><small>\u6765\u6e90\uff1aHacker News \u00b7 RSS \u91c7\u96c6<\/small><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Just for fun and self education, I&#8217;ve built this  [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ai_generated_summary":"","footnotes":""},"categories":[7],"tags":[],"class_list":["post-1337","post","type-post","status-publish","format-standard","hentry","category-tech"],"_links":{"self":[{"href":"https:\/\/wp.rungobag.cn\/index.php\/wp-json\/wp\/v2\/posts\/1337","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.rungobag.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.rungobag.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.rungobag.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.rungobag.cn\/index.php\/wp-json\/wp\/v2\/comments?post=1337"}],"version-history":[{"count":0,"href":"https:\/\/wp.rungobag.cn\/index.php\/wp-json\/wp\/v2\/posts\/1337\/revisions"}],"wp:attachment":[{"href":"https:\/\/wp.rungobag.cn\/index.php\/wp-json\/wp\/v2\/media?parent=1337"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.rungobag.cn\/index.php\/wp-json\/wp\/v2\/categories?post=1337"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.rungobag.cn\/index.php\/wp-json\/wp\/v2\/tags?post=1337"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}