Clear, and no moon.
Orion has just cleared the trees.晴，无月。
猎户座刚过树线。
Cloud 0% · Moon below horizon云量 0% · 月在地平线下
They live in this browser only — no account, no server. Clearing site data erases them, so keep a copy if they matter.它们只存在这台设备的这个浏览器里 —— 没有账号，没有服务器。清理网站数据就会消失，如果这几句话对你重要，留一份副本。
The sky sits behind the screen. That is the whole difference. Lay it flat on a table and you are looking at the sky from outside — every shape mirrors, and no amount of twisting fixes it.天空在屏幕的后面。区别只有这一点。平放在桌上，你是在从外面看天 —— 一切形状都会镜像，怎么扭都救不回来。
So this page is a window, not a map. The round chart is the map. This one is for pointing.所以这一页是窗，不是地图。圆盘才是地图。这一页是用来指的。
Drag anywhere, or use the dial in the corner — tap for a small step, hold to keep turning. The reading at the bottom tells you which way you face.在任意处拖动，或用角上的舵盘 —— 点一下走一小步，按住就连续转。底部的读数告诉你此刻朝哪边。
There is no compass in this build. The page does not know which way you are facing, so it cannot turn itself. Drag until a shape you recognise sits where you see it above you — then everything else follows.这一版还没有罗盘。页面不知道你朝哪边，所以它没法自己转。拖到某个你认得的形状正好落在你头顶的方向，其余的就都对上了。
Cloud cover comes from Open-Meteo, hour by hour, for one coordinate. If it cannot be fetched you will see a dash — not a zero. Star positions are worked out on your phone from a J2000 catalogue. The cloud request carries one coordinate and nothing else: no device id, no history, no name.云量来自 Open-Meteo，逐小时，只带一个坐标。取不到时你会看到一个 —— 而不是一个 0。星星的位置是在你手机上用 J2000 星表算出来的。云量请求只带一个坐标，别的什么都不带：没有设备号、没有历史、没有名字。
Red light keeps your eyes adapted. The half-circle in the corner tints the page.红光让眼睛保持暗适应。角上的半圆会把整页染色。