There's a limitation in the Time dialog box which doesn't accept any year greater/lower than +/-9999. It's inconsistent with the fact that we can now accelerate time up to 2 billion years in the future or in the past !
And the time reversing when we reach the limit is annoying and confusing : going to the last year brings suddenly the user to a negative year, far away in the past. When the user reaches the last year (it should be a round date like 2 000 000 000, so the user could easily interpret what is going on), Celestia should simply stop all motions. Vincent already have done some coding to do this. Currently, Celestia doesn't behave in a consistent and easy to inerpret way.
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