Using astral to go back in time

So first i dont have any experience with astral travel , just with lucid dreams . The reason why im opening this theard is because a book i have read , the book isnt in english but in a chapter of the book is writed a experience of a person who find a dimension while traveling in astral that if you change things there you can change them in reality . This chapter was very vague and i need to ask Is this possible or someone have heard about this dimension ? the person who have write the book have many experience with astral also is a master with hypnosis

This thread has some discussion around the subject.