⌛ 银河年 ↔ 希勒克Galactic year (~230 Myr) to Helek (1/18 min)
银河年与希勒克互算（1 Gyr gal = 2.17779984e+15 helek）。本地换算，附常用相关单位。Convert galactic year (~230 Myr) and helek (1/18 min) (1 Gyr gal = 2.17779984e+15 helek). Runs locally with related units.
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
「银河年 ↔ 希勒克」是什么？What is the Galactic year (~230 Myr) to Helek (1/18 min) tool?
银河年与希勒克互算（1 Gyr gal = 2.17779984e+15 helek）。本地换算，附常用相关单位。Convert galactic year (~230 Myr) and helek (1/18 min) (1 Gyr gal = 2.17779984e+15 helek). Runs locally with related units.
如何使用「银河年 ↔ 希勒克」？How do I use the Galactic year (~230 Myr) to Helek (1/18 min) tool?
在「银河年 ↔ 希勒克」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 Galactic year (~230 Myr) to Helek (1/18 min) and choose the source unit; the table shows the value in every other unit at once, ready to copy.
1 银河年等于多少希勒克？How many helek (1/18 min) in 1 galactic year (~230 Myr)?
1 Gyr gal = 2.17779984e+15 helek（按国际定义系数）。1 Gyr gal = 2.17779984e+15 helek (international definition).
如何把银河年换算成希勒克？How do I convert galactic year (~230 Myr) to helek (1/18 min)?
结果 = 数值 × 2.17779984e+15。例如 4.591790217e-16 Gyr gal = 1 helek。result = value × 2.17779984e+15. Example: 4.591790217e-16 Gyr gal = 1 helek.
银河年/希勒克属于哪类单位？What kind of units are galactic year (~230 Myr)/helek (1/18 min)?
二者同属「时间」量纲，可安全互算；也可打开「time-unit-converter」做多单位对照。Both are time units; see also the time unit converter hub.
换算系数准确吗？Are the conversion factors exact?
「银河年 ↔ 希勒克」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 Galactic year (~230 Myr) to Helek (1/18 min) uses factors defined by the SI or other recognised standards and shows about 10 significant digits.
「银河年 ↔ 希勒克」免费吗？需要注册吗？Is the Galactic year (~230 Myr) to Helek (1/18 min) free? Do I need an account?
「银河年 ↔ 希勒克」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 Galactic year (~230 Myr) to Helek (1/18 min) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.