The heliacal rising of a star (or other body such as the moon or a planet) occurs when it first becomes visible above the eastern horizon at dawn, after a period where it was hidden below the horizon or when it was just above the horizon but hidden by the...
The Nile (Arabic: â, translit: , Ancient Egyptian iteru, Coptic piaro or phiaro) is a major north-flowing river in Africa, generally regarded as the longest river, though not the most voluminous, in the world. The ancient Egyptian year was 365 days long, and apparently did not have any intercalary days added to keep it in alignment with the Sothic year, a kind of sidereal year.
Normally, a sidereal year is considered to be 365.25636 days long, but that only applies to stars on the ecliptic, or the apparent path of the Sun.
Because Sirius is not on the ecliptic, the wobbling of the celestial equator and hence of the horizon at the latitude of Egypt causes the Sothic year to be slightly smaller.
Give contextual explanation and translation from your sites !This document does not give the beginning of a Sothic cycle, but a calendar date for the rising of Sirius, which can be retrocalculated as 1872 BC if the sighting of Sirius was made in the Memphis-Lahun region.If, however, the sighting was made at the lower latitude of Elephantine, as Rolf Krauss has recently advocated, the date would be reduced to 1830 BC." The only other Sothic date comes from the Ebers Papyrus for year 9 of Amenhotep I.If this does indicate the beginning of a Sothic cycle, it must date to about 2773 BC (July 17).
206 years (1991-1785 BC), based on July 17 of 1872 BC as the Sothic date (120th year of 12th dynasty, a drift of 30 leap days) ...
If in addition to this formula, a document tells us that Sirius rose heliacally on that day it is only necessary to count the number of days which had elapsed since the first day of the year given in the formula and multiply the total by four to obtain the number of years since the beginning of the particular Sothic cycle." Now the fact is that we only have two such Sothic dates, and one of them is no good.