They don't point towards any constellation. As pyramids, they point *up*, and whatever is at the zenith changes from night to night, depending upon where you are on Earth. (The zenith does not change much if you're on the north or south pole, but the Giza pyramids are far from the poles.)

What you may be indirectly thinking of is a theory by Robert Bauval and Adrian Gilbert, (but mostly Robert Bauval) in their book "The Orion Mystery" where they make several unusual theories based on what has been shown to be rather spotty, and often incorrect starting data and presumptions. Among these is that the *air shafts* within the great pyramid point towards various stars or constellations, and may have been used to provide light shining into the pyramid from stars.. This was shown in 1993 to be patently impossible by Rudolf Gantenbrink who sent a GPS-equipped robot up the shafts to map them. For one thing, the shafts are blocked, neither are they straight, and in Egypt any star shining upon the shaft would no longer shine upon it in short order due to the Earth's daily axial rotation. For really good information on this, go directly to Rudolf Gantenbrink's web page at http://www.cheops.org/ for more information on the Upuaut project.

Another of Bauval's theories is that the layout of the major pyramids at Giza resemble the layout of the three bright stars in the belt of the constellation Orion, shown in an impressive overlay photo pairing here: http://doernenburg.alien.de/alternativ/orion/ori00_e.php

Kate Spence argues well against this theory in "Astronomical Orientation of Pyramids" which appeared in Nature, available for purchase at: http://www.nature.com/nature/journal/v408/n6810/full/408320a0.html

So in short, the pyramids don't point at any particular constellation.
Source(s):
http://www.cheops.org/
http://www.nature.com/nature/journal/v408/n6810/full/408320a0.html
http://doernenburg.alien.de/alternativ/orion/ori00_e.php
http://www.businessweek.com/bwdaily/dnflash/sep2002/nf20020913_7248.h

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