Most sources indicate that Tut came to the throne around 1336 and died around 1327 BC. Dr Hawass (and a few other very recent sources) indicate that he reigned earlier, around 1365-1354 or so. Some give dates in between these two extremes.

Can anyone indicate where this discrepancy has risen from? I'm interested in astronomical events for the period of Tut's life and this would sure make a difference. Does anyone have a lead on those events as well.

Thanks in advance. You guys are swell!

Older works I've check give an earlier date---1400 B.C. in both "Aegyptische Zeitschrif" and in a paper prepared and presented by Davis-Maspero_Daressy in 1905.
Cambride4 University in their book "Pharaohs if the Sun" date his reign later, in 1340 B.C.
Hope this helps...