It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Thank you.
Some features of ATS will be disabled while you continue to use an ad-blocker.
No. Try this location: +35º, -150º. On July 8. Due to precession, longitude (depending on how precise you want to be), and latitude, the dates will be different but it happens all over the planet.
i can't explain that at all as it only happened in area around Cairo????
www.universeguide.com...
The star is moving -1,223.10 milliarcseconds/year towards the north and -546.00 milliarcseconds/year east if we saw them in the horizon. .
originally posted by: Grenade
a reply to: Astronomer62
I can't get my head around this at all. Just to be clear according to the modelling software this alignment was consistent everyday for 2000 years? Are you able to find other similar occurrences with any other stars at different co-ordinates? I know its a needle in a haystack but surely this isn't an isolated anomaly?
I'm using two degrees measure (one degree either way of curve), with curve of the Earth, but during this period as yet, i haven't found another area where the Sun and Sirius were rising on any day for as long as this.
All stars are "subject" to precession. All stars also have proper motion of their own.
but other stars are subject to precession.
They would be in error.
Some might say that the Sun is twinned with Sirius!
originally posted by: Phage
I'm using two degrees measure (one degree either way of curve), with curve of the Earth, but during this period as yet, i haven't found another area where the Sun and Sirius were rising on any day for as long as this.
Then you didn't look very hard.
Sunrise at 35ºN, 150ºE
4042 BC
1681 BC
You can right click to view full sized.
All stars are "subject" to precession. All stars also have proper motion of their own.
but other stars are subject to precession.
They would be in error.
Some might say that the Sun is twinned with Sirius!
It happens at any latitude, just on a different day.
I have to admit that i hadn't researched much regarding other area's where this took place, along the 35th parellel North, however you are correct that it did happen there, i found it in Saveh, Iran:-
Only because you are obsessed with one event. Sirius is affected by precession.
It would seem Sirius is strange by the effects of precession using the Julian Calendar and some would say as a year marker it was twinned with the Sun for far longer than Precession dictates by one degree every 72 years.
The Sothic cycle or Canicular period is a period of 1,461 Egyptian civil years of 365 days each or 1,460 Julian years averaging 365¼ days each. During a Sothic cycle, the 365-day year loses enough time that the start of its year once again coincides with the heliacal rising of the star Sirius
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. However, because the civil calendar was exactly 365 days long and did not incorporate leap years until 22 BC, 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.) The sidereal year of 365.25636 days is only valid for stars on the ecliptic (the apparent path of the Sun across the sky), 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 civil or 1460 Julian years.
The Sothic year is remarkable because its average duration was exactly 365.25 days in the early 4th millennium BC before the unification of Egypt. The slow rate of change from this value is also of note. If observations and records could have been maintained during predynastic times the Sothic rise would optimally return to the same calendar day after 1461 calendar years. This value would drop to about 1456 calendar years by the Middle Kingdom. The 1461 value could also be maintained if the date of the Sothic rise were artificially maintained by moving the feast in celebration of this event one day every fourth year instead of rarely adjusting it according to observation.
It has been noticed, and the Sothic cycle confirms, that Sirius does not move retrograde across the sky like other stars, a phenomenon widely known as the precession of the equinox. Professor Jed Buchwald wrote "Sirius remains about the same distance from the equinoxes—and so from the solstices—throughout these many centuries, despite precession." [11] For the same reason, the heliacal rising or zenith of Sirius does not slip through the calendar at the precession rate of about one day per 71.6 years as other stars do but much slower. This remarkable stability within the solar year may be one reason that the Egyptians used it as a basis for their calendar. The coincidence of a heliacal rising of Sirius and the New Year reported by Censorinus occurred about the 20th of July, that is a month later after the summer solstice.