Post History
The technique should work. I can't really say much besides that. There are other things they could do, too. They might not be easier than tracking the proper motion of a star, but they'll work: ...
Answer
#1: Attribution notice removed
by
System
·
2020-06-01T14:13:43Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/9726 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/