A bit of a childish question. Is it possible for God to change the past? or is it one of those things that are generally possible but in certain occasions will never happen?
I'm asking because of this (right column, 17 line from below):
כי הנה הדברים העוברים שלא יהיו אינן נופלים תחת היכולת האלוהי
"… since the things that have already passed, to not be, does not fall under G-d's ability"
(R' Abarbanel discusses the notion of 'Mazel' and how it effects Israel (a person/a people. At this part he explains Rav's opinion [Shabat 116] and his proof of "Leave your astrology", which cannot be interpreted as "I can change what happened and you shall give birth".)
Is there another known reference to this?