Baketi names and forms from your corrected table. Baketi is the term used by the astronomer whose tradition this school follows for the ten-day star-groups the Greeks later called decans. Hours of the night from the Amduat of Papyrus Leiden T. 71, hours of the day from the Book of the Day of Ramesses VI, read from Müller-Roth. The fourteen of the waxing moon from Dendera, Outer Hypostyle Hall. Feast days from the Edfu chronokrator list and the Dendera Khoiak texts. The modern star behind each baketi, the actual point of light that rises with it, comes from a living observational reconstruction that agrees with Neugebauer and Parker at the two decans they held certain, Sirius and Orion. The stars between those two anchors are careful inference rather than attested fact.

The Sothic year begins on the morning Sirius first becomes visible again, the heliacal rising the temples watched for. It is computed at Elephantine, the island at the first cataract that was the ancient southern watch-point: the sighting travelled up the Nile and was caught there first, where the flood was also first measured. The criterion is the classic one for Sirius, the star just clear of the horizon as the sun reaches nine and a half degrees below it. This first visibility falls a fortnight or so after the cosmical rising, the earlier morning when Sirius clears the horizon ahead of the sun but is still lost in the dawn light. The calendar shows both, and opens the year on the sighting, the event a watcher on the temple roof could actually see. And a sighting outranks any computed date: where the rising has been watched for and seen, that morning is the one the year turns on, the computed date standing only as the prediction the sighting confirms. This year the rising was observed directly, and the year opens on the morning she was seen. The year is reckoned by season first, Akhet the inundation, then Peret the emergence, then Shemu the harvest, each of four months. The months carry their older Egyptian names, Tekhy, Menkhet, Hut-Her and the rest, the festival names that lie beneath the Greek Thoth and Paophi. Years are numbered from 139 CE, when the civil New Year and the rising last coincided. The wandering year is the ancestral 365-day form, anchored to the same 139 CE coincidence and drifting a day every four years since.

The lunar month begins at psedjentyu, the morning the old crescent can no longer be seen, tested with Yallop's criterion. Positions from Meeus.