My name is Ashirwad Tillu. I am from Mumbai, India and passionate in Astronomy. Now, retired from my long career in Information Technology and fully focusing on my above passion. I have been user of Sky Safari 5 earlier and now ver 6 Pro.
My current interests are also in the area of Ancient historic calendars. I wish to compute the old positions of few selected stars. (How old? Say 7000 to 8000 years ago.). Sky Safari does have features to set very old dates. I have a query about the star positions shown in the App when I set very old dates.
Now coming towards my question : Now the star positions, as we observe in the night sky, would get changed over the years, due to two factors
- Precession in the Earth’s rotation, which will reflect on the star changing its position
- Inherent motion of the star due to expanding universe
Does Sky safari app and its database account for both the above factors?
If yes, can I simply set the old date, and select a particular star say Arcturus, and note down its RA, DEC at that old date?