Excuse me for jumping in, but why didn't any of the Apostles, or any of the other writers of the Scriptures, write about this? Where is this written about?
Additionally, the letters of Peter and James were written before the Gospels, so one has to question why, if they didn't include an account of the Assumption, they didn't include accounts of the Ascension of Jesus, either. Economy of teaching, perhaps, but the fact that the eye witnesses to the Ascension did not give account of the event makes credible that they would not give account of the Assumption, either.