Oh, great, thanks for your answers. I'll try that then. I confirm I am using a version I downloaded from a github repository a long time ago, and never questioned whether there was another version on Openrepos because I remembered the one I downloaded was not actively developed but was a solution since nothing else was available at the time. Didn't know someone else picked up on maintaining Stellarium for Sailfish.

stellarium-sf still runs on my Jolla C though, and it is only one SFOS upgrade late, so maybe stellarium-sf stopped working with SFOS3 but not with the early 2.x.