ET1 EmergencyLanding
A free physics simulation — play it in your browser, no install. Orbital approach prototype — guide a crippled ship into low orbit on limited fuel. Single-file HTML5 canvas, no dependencies.
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Open the live demo Source on GitHubFrom the README
主機関を失った宇宙船 ElmarTail One (ET1) を、限られた燃料で惑星の低軌道まで導く軌道力学プロトタイプ。 依存関係なしの単一 HTML ファイル。ブラウザで index.html を開くだけで動きます。
惑星と月の 2 つの重力源をもつ制限三体問題を、セミインプリシット Euler 法で 1 フレームあたり 8 サブステップ積分しています。予測線は現在の状態から同じ積分器で 600 ステップ先まで前方シミュレーションした結果で、月の位置も時刻の関数として正しく追従します。
軌道要素 (PE / AP) は月の影響を無視した惑星のみの二体近似で、比軌道エネルギーと角運動量から算出しています。あくまで表示用の目安です。
軌道投入フェーズ (Phase 1) のプロトタイプです。BEGIN LANDING を押した先の降下フェーズ (Phase 2) は未実装で、クリックハンドラにプレースホルダが置いてあります。
物理エンジンは Mahito KIDA の Solar Colony がベースです。
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