I read this thread with interest. I’m an amateur astronomer and do some astrophotography. I use stellarium (I saw some other threads wondering about it’s validity). Star trails are a problem we fight in astrophotography regularly because they ruin long exposure images. Anyway, I can take a video of myself setting up and capturing a celestial object if that helps. I’d do it live - so no modification involved. It’s just a refractor and cmos camera, so nothing tricky.