Sothis, the Dog Star, turns out to be the variable that solves the problem of the exact dating of the construction of the Great Pyramid at Giza for one Egyptian team. Like any good debate, this article examines both sides: the Egyptians present their evidence and others counteract.
I like to stray from saying "a culture always did something this way" when describing a peoples' endeavors because people are quite unpredictable (even Ancient Egyptians, who seemed to be very purposeful when it came to all aspects of the humanities!). Although scholars like to pin things down (or try to), sometimes one has to be satisfied with words like "probably," "about," "perhaps" and the like.