🌌 秒差距换算Parsec Converter
秒差距（pc）与光年、天文单位、米换算（IAU）。支持秒差距、光年、天文单位、米、千米互算。Convert parsecs to light-years, AU and metres (IAU). Units: parsec, light-year, astronomical unit, metre, kilometre.
点击任意一行可复制该结果；小于 0.0001 或不小于 10¹⁵ 的数值用 × 10ⁿ 科学计数法显示Click any row to copy that result. Values below 0.0001 or at least 10¹⁵ are shown in × 10ⁿ notation
使用说明与常见问题How-to & FAQ
「秒差距换算」是什么？What is the Parsec Converter tool?
秒差距（pc）与光年、天文单位、米换算（IAU）。支持秒差距、光年、天文单位、米、千米互算。Convert parsecs to light-years, AU and metres (IAU). Units: parsec, light-year, astronomical unit, metre, kilometre.
如何使用「秒差距换算」？How do I use the Parsec Converter tool?
在「秒差距换算」中输入数值并选择原单位，表格会同时列出换算到所有其他单位的结果，可一键复制。Enter a value in the Parsec Converter and choose the source unit; the table shows the value in every other unit at once, ready to copy.
定义？Definition?
1 pc = 648000/π AU（IAU 2015）。1 pc = 648000/π AU (IAU 2015).
有哪些选项可以调整？What options can I adjust?
「秒差距换算」的设置：「数值」默认 1。每次生成结果都按当前设置处理。Settings in the Parsec Converter — "Value" default 1. The result always uses the current settings.
换算系数准确吗？Are the conversion factors exact?
「秒差距换算」采用国际单位制（SI）或公认标准中的定义值作为换算系数，结果保留约 10 位有效数字。The Parsec Converter uses factors defined by the SI or other recognised standards and shows about 10 significant digits.
「秒差距换算」免费吗？需要注册吗？Is the Parsec Converter free? Do I need an account?
「秒差距换算」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Parsec Converter is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.