My best guess would be using a standard coordinate system such as https://en.m.wikipedia.org/wiki/Supergalactic_coordinate_system https://en.m.wikipedia.org/wik

My best guess would be using a standard coordinate system such as https://en.m.wikipedia.org/wiki/Supergalactic_coordinate_system https://en.m.wikipedia.org/wiki/Supergalactic_coordinate_sys...