📐 按夹角反推时钟时间Set Clock Hand Angle

使用说明与常见问题How-to & FAQ

「按夹角反推时钟时间」是什么？What is the Set Clock Hand Angle tool?

给定时针与分针的夹角（0-180°），列出一天中夹角正好相等的整分时刻（可设容差）。本地处理。Given an hour-minute hand angle (0-180°), list the whole-minute times in a day whose angle matches exactly (optional tolerance). Processed locally.

如何使用「按夹角反推时钟时间」？How do I use the Set Clock Hand Angle tool?

输入 0–180 之间的角度（如 90），下方即列出夹角正好等于它的整分时刻；需要近似结果时可以设置容差。Enter an angle from 0 to 180, such as 90, to list the whole-minute times with exactly that angle between the hands; set a tolerance if you also want near matches.

为什么 90° 只有 4 个时刻？Why does 90° give only four times?

整分时刻的夹角是 |30×小时 − 5.5×分钟|（超过 180° 时取 360° 减去它），总是 0.5° 的倍数。正好 90° 的整分时刻只有 03:00、09:00、15:00、21:00；像 00:49 这样的时刻实际是 90.5°，只有设置容差时才会列出。The angle at a whole minute is |30 × hour − 5.5 × minute| (or 360° minus that when it is over 180°), so it is always a multiple of 0.5°. Only 03:00, 09:00, 15:00 and 21:00 are exactly 90°; a time such as 00:49 is really 90.5° and is listed only when you set a tolerance.

容差有什么用？What does the tolerance do?

默认 0，只列出夹角完全相等的时刻；设为如 0.5 时会列出夹角在该范围内的时刻，每个时刻后面都标出实际夹角。It is 0 by default, so only exact matches are listed. With a value such as 0.5, times within that many degrees are listed too, each followed by its actual angle.

没有完全相等的时刻会怎样？What if no time matches exactly?

会说明没有整分时刻正好是该角度，并给出最接近的角度和对应时刻。The tool says that no whole-minute time has exactly that angle and gives the closest angle and the times that have it.

和时区有关吗？Do time zones matter?

无关，这里只处理钟面时间或日历日期，不读取设备时钟，也不考虑夏令时。No. It works on clock readings or calendar dates only, never reads your device clock and ignores daylight saving time.

输入和输出是什么样的？What does the input and output look like?

例如输入 90，输出为：03:00 (90°) ⏎ 09:00 (90°) ⏎ 15:00 (90°) ⏎ 21:00 (90°)（⏎ 表示换行）。The input 90 becomes 03:00 (90°) ⏎ 09:00 (90°) ⏎ 15:00 (90°) ⏎ 21:00 (90°) (⏎ marks a line break).

有哪些选项可以调整？What options can I adjust?

「按夹角反推时钟时间」的设置：「容差（度）」默认 0。每次生成结果都按当前设置处理。Settings in the Set Clock Hand Angle tool — "Tolerance (degrees)" default 0. The result always uses the current settings.

「按夹角反推时钟时间」免费吗？需要注册吗？Is the Set Clock Hand Angle tool free? Do I need an account?

「按夹角反推时钟时间」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 Set Clock Hand Angle tool is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.