Sirius isn't the only star to do this, but it is the brightest which makes it special, and it is this reason that it was used as a calendar star, but it only works with the Julian Calendar.
I'm pasting the quote needed below:-
"Mechanics
The ancient Egyptian civil year, its holidays, and religious records reflect its apparent establishment at a point when the return of the bright star Sirius to the night sky was considered to herald the annual flooding of the Nile.[2] However, because the civil calendar was exactly 365 days long and did not incorporate leap years until 22 BCE, its months "wandered" backwards through the solar year at the rate of about one day in every four years. This almost exactly corresponded to its displacement against the Sothic year as well. (The Sothic year is about a minute longer than a Julian year.)[2] The sidereal year of 365.25636 days is only valid for stars on the ecliptic (the apparent path of the Sun across the sky) and having no proper motion, whereas Sirius's displacement ~40° below the ecliptic, its proper motion, and the wobbling of the celestial equator cause the period between its heliacal risings to be almost exactly 365.25 days long instead. This steady loss of one relative day every four years over the course of the 365-day calendar meant that the "wandering" day would return to its original place relative to the solar and Sothic year after precisely 1461 Egyptian civil years or 1460 Julian years.[1] "
The error in the Julian Calendar are three leap days every 4 hundred years which is also applied to Sirius!
https://en.wikipedia.org/wiki/Sothic_cycle#Mechanics
I'm pasting the quote needed below:-
"Mechanics
The ancient Egyptian civil year, its holidays, and religious records reflect its apparent establishment at a point when the return of the bright star Sirius to the night sky was considered to herald the annual flooding of the Nile.[2] However, because the civil calendar was exactly 365 days long and did not incorporate leap years until 22 BCE, its months "wandered" backwards through the solar year at the rate of about one day in every four years. This almost exactly corresponded to its displacement against the Sothic year as well. (The Sothic year is about a minute longer than a Julian year.)[2] The sidereal year of 365.25636 days is only valid for stars on the ecliptic (the apparent path of the Sun across the sky) and having no proper motion, whereas Sirius's displacement ~40° below the ecliptic, its proper motion, and the wobbling of the celestial equator cause the period between its heliacal risings to be almost exactly 365.25 days long instead. This steady loss of one relative day every four years over the course of the 365-day calendar meant that the "wandering" day would return to its original place relative to the solar and Sothic year after precisely 1461 Egyptian civil years or 1460 Julian years.[1] "
The error in the Julian Calendar are three leap days every 4 hundred years which is also applied to Sirius!
https://en.wikipedia.org/wiki/Sothic_cycle#Mechanics
| The ancients built stone circles, many show Equinox's and Solstices, it would seem by video below that Sirius was viewed by a roof box in Newgrange in Ireland. It is open to debate if ancient people knew that 365 days were a year and perhaps added a leap day every four years by viewing Sirius. I know i am speculating but could the same be true for Gobekli Tepe? https://arxiv.org/ftp/arxiv/papers/1307/1307.8397.pdf https://www.newscientist.com/articl...-oldest-temple-built-to-worship-the-dog-star/ Interesting astronomy pictures below regarding Gobekli Tepe, people may have been viewing Sirius for a calendar for over 11,000 years! So at least Sirius and Earth are binary in that sense of marking out a calendar, if it is more mysterious i leave to good astrologers, i am a humble archaeoastronomer, link again below:- https://humanoriginproject.com/sirius-mythology-two-sun-solar-system/Better graphs below regarding Sirius when it first appeared above the horizon in Gobekli Tepe:- https://tartariatablets.com/2021/04/18/gobekli-tepe-alignments-to-sirius/ |
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