https://blog.wongcw.com/2022/01/15/lunar-artefacts%e7%99%bc%e5%b8%83%e5%94%ae%e5%83%b9250%e7%be%8e%e5%85%83%e7%9a%842pointer-instrument%e7%9a%ae%e9%9d%a9%e9%bc%a0%e6%a8%99/