Yeah, lots or "apparent" and "actual" in astronomy because most of what looks like is happening is not how it actually is. Eg. Vega and Deneb have the same apparent brightness even though Deneb is 1000s times brighter but much further away. So all the constellations on or near the zodiac appear to go round us each year but they don't. Each night as we look out into space the Earth has moved in its orbit around the Sun a bit more (anticlockwise, looking from above the plane of the solar system) So everything appears to drift Westwards. In August the Sun gets in the way and we cant see Orion. Again, I expect you know the basics of planetary motion but I just love banging on about this stuff!
stuck wrote: ↑20 Sep 2021, 07:59I've not looked into this so I'll do it the lazy way and just ask you. Is it clever enough to align the frames, i.e. not need a motorised mount on the tripod to ensure the camera tracks the night sky?
It's worth a try! Trouble is if you don't track the sky on an equatorial mount then your series of tripod captured frames will suffer from field rotation caused by the tilt of the axis of the Earth with respect to the plane of its orbit. Deep Sky Stacker might be able to sort it. I'm not sure.