http://www.moses-egypt.net/star-map/senmut1-mapdate_en.asp

The astronomical knowledge of the ancient Egyptians turns out to be
surprisingly broader than previously imagined. According to a new
analysis, the world's oldest star-map seems to contain information of
an actual celestial event of its time. This recent discovery uncovers
the earliest exact scientific description of an otherwise rare but not
unknown celestial phenomenon.

This 3,500-year old star-map, which decorates one of the
ceilings in the tomb of the great Senmut (Senenmut) near Luxor
(Thebes), apparently demonstrates a previously unknown aspect of the
astronomical situation in Egypt around 1,500 BC. This revelation is
the result of investigations by Danish researcher Ove von Spaeth, and
is published in July-August 2000 in vol. 42 of the international
journal of the history of science, "Centaurus".

The map's configurations, which previously have been
considered mostly as mythological displays, are now disclosed to be an
accurate depiction of a rare gathering of planets in well-defined
celestial positions. The information contained in the map refers to a
specific point of time.
The re-evaluation of this and subsequent maps gives birth to
new perspectives: by introducing these new reference points of time,
the appropriate chronology of the epoch in question, which has been
much disputed, may now be dated with considerably greater precision
than heretofore possible.