Some Egyptologists have entertained the general idea that some astronomical correlations might exist in Ancient Egyptian monuments, but the OCT has not, to date, found support from many in the field. Among the theory's critics have been two astronomers: Ed Krupp of Griffith Observatory in Los Angeles, and Anthony Fairall, astronomy professor at the University of Cape Town, South Africa. Krupp and Fairall independently investigated the angle between the alignment of Orion's Belt to North during the era cited by Bauval (which differs from the angle in the 3rd millennium BCE, because of the precession of the equinoxes), and found that the angle was somewhat different from the 'perfect match' claimed by Bauval and Hancock: 47 to 50 degrees, compared to the 38-degree angle formed by the pyramids.[6]