Regis

Thank you very much for your quick & comprehensive answer, it's great!
I got this tree as a gift about 1,5 months ago. It had perfect foliage, but after a few days, the leaves began to drop, because I didn't water it properly and also of the shock it experienced during the move, which you've described in your post.

I was afraid that the tree is already dead, but after I began soaking the tree instead of normal watering, it started to recover and now it's much better ( even better than the photo i've attached - it was taken on 8th November ).

I think, that now I understand what the leaves do. I was bit mistaken elsewhere, so I thought, that tree should be kept in exact position all the time, no rotation etc. I'll also try to adjust the watering the way you've written.

So, I'll have two more questions. You've mentioned the "black spot" attack, which I can also see on my tree. What is the cause of it? Just these yellowing leaves?
And finally, may I fertilize the tree at this time or not? I heard that fertilizing could be dangerous for unhealthy trees.