When you click on an area containing several superimposed objects, there is no clear rule on wich object will be selected.
Furthermore, the other objects cannot be selected except by zooming so much as to have the two objects separated.
Case: point towad Andromeda constellation and try to select Mirach.
Result: NGC404 is selected. This is quite a faint object compared to Mirach (Mag 10 againts mag 2).
Workaround: zoom in until separation permits selection.
Recommendations:
1 - first selected object should be either:
- the closest from observers (planets, then stars , then dso)
- or the brightest first
- or the bigger first (large planets, nebulae, small planets, satelites, stars )
2 - clicking on an already selected area should check if there is someting else behind that could be selected.
With these two recommendations, in the above case:
- on first click, Mirach is selected
- on second click, NGC404 is selected
- on third click, Mirach is again selected
- ...
DSO have high priority for selection, other objects have priority which related with visual magnitude of those objects. Also UI for "heaven" have only one click.