<div style="padding:40px;color:#cbccc6"><h1>中心引力速度场</h1><p>圆形轨道速度场（圆周运动方向）。</p><div style="padding:20px;background:#0d1017;border-left:3px solid #ffb454"><span class="katex-error" title="ParseError: KaTeX parse error: Got function '\\' with no arguments as subscript at position 22: …r=v_r\\hat r+v_\̲\̲theta\\hat\\the…" style="color:#cc0000">\\dot r=v_r\\hat r+v_\\theta\\hat\\theta</span></div><p style="color:#707a8c">该页面需要 JavaScript 进行交互式可视化。</p></div>