![]() The remarkable discovery of this correspondence with the length of the solar year became the foundation for my study of the infrastructure of ancient Egypt. Hence, the Egyptians were aware of the earth’s precession and they observed its effect. In all cases, the two locations are separated by 365 minutes of arc. In the course of the centuries, the imaginary line that first ran from south of Edfu to Saïs/Xoïs was later on, during the reign of the fourth Dynasty, reset to extend from Philae to Heliopolis. After the reign of the third Dynasty, a new dual set of observation posts was established. The settlements in Upper and Lower Egypt that served as observation posts (Thronstätten: Hieraconpolis and Buto) became the prehistoric capitals of Egypt the geographical latitudes of these two locations are separated by 365 minutes of arc. ‘Thronstätten’, and the parallels (latitude) of the prehistoric capitals van Oosterhout wrote on this subject ( Discussions in Egyptology DE 24). This result fits perfectly and confirms the earlier study and the solid conclusions in an article which emeritus Prof. Hence, a ‘first visible rising’ of Sirius did indeed take place shortly before sunrise. The Arcus Visionis and the critical depth of the sun below the true horizon was 9.40, occurring precisely at the upper limit of the critical height of the sun (lower limit 8.534 -8.567, upper limit 9.378 – 9.411). The heliacal rising of Sirius occurred on IV SMW 30 (July 13), approximately 50 minutes before sunrise. We set the star map for July 13th (Julian Calendar) in the year 4,501 BC, 04h00 AM, over the prehistoric agglomerated settlements Deir Tasa and El Badari. The heliacal rising of the star Sirius at El BadariĪ star map, created by Skyglobe 3.6, shows the heliacal rising of the star Sirius at a given date. This process repeated itself throughout history. The importance of these specific locations disappeared in the process of time and as a consequence, new settlements were established elsewhere, along the river Nile. In the course of many millennia, the selection of points that enabled a precise observation to be made on a specific day of the year had to be amended as a result of the earth’s precession and the proper motion of the star Sirius. Obviously, the observation of this astronomical phenomenon was of great importance. The calculated day of observation at a certain parallel of latitude at a certain location (fixed point, for instance gnomons) supports the thesis that a form of triangulation determined the infrastructure of pre-, proto- and historic Egypt. Astro-geodesy and the Planological Infrastructure of Egypt Definition of the subject:īased on a geodetic Observation-line between certain locations in ancient Egypt, some dates of observation of the heliacal rising of the star Sirius have been calculated and are presented here.
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