1:st sept 5509 BC?

Recall Sunday Letters?

Well, I was checking each chronology as per creation of man on Friday March 25th.

With Creation on Sept 1:st, we need to check if the sequence of Sunday letters are correct if Year of Creation is Sunday 1st of September and that in 5509 BC.

So, recall the verse?

Alla de dagar Gud böd eder gå, christeligen fram att dem fullborda?

September 1:st is an F, and this would make 5509 Sunday letter F. The non-extant first days of January 5509 BC would have been:

A	Tuesday		E	Saturday
B	Wednesday		F	Sunday
C	Thursday		G	Monday
D	Friday

Why is this important? Well, this means we can translate "Sunday letter F" to "common year starting on Tuesday" and "Sunday letters GF" to "leap year starting on Monday".

This is the format of calendars on wikipedia. 1968 was a leap year starting on Monday. In Gregorian calendar, the periodicity is 400 years for the larger period. Short period mainly 28 (as always in Julian), while the centurial years with no leap years (three out of every four) involve a period of 12 when the years passing between centurial year and the relevant Sunday letter type year are less than 12, like 4 or 8 but 40 when equal to 12.

But as the periodicity of 40 is used only once for 400 years, as far as I could check, this will involve us in some trouble.

1968 AD		7477 AM		277 AM		221 AM
5509		4000		056		209 AM
7477 AM		3477 AM		221 AM		012 !
		2000		040
		1477 AM		181 AM		125 AM
		1200		056		109 AM
		0277 AM		125 AM !		016 !

We cannot make 2016 a parallel, since 2000 was a leap year. So, how about 1916?

Let's check. It was a : "leap year starting on Saturday of the Gregorian calendar". When was previous such?

"Century leap years are always leap years starting on Saturday and February 29 is always on Tuesday." - So, in 1900!

This would make AM 209, 109, 9 all leap years starting on Saturday.

Er, no. I misunderstood. Century leap years are those in the centuries divisible by 400 - since other centurial years are not leap years!

1900 AD was a common year starting on Monday, and previous leap year starting on Saturday was 1876 - 40 years before 1916.

So, perhaps it is best to simply see whether a leap year starting on Monday will occur as many years before 1968 as Creation year is before 277 AM? That is, 276 years earlier.

1968
0276
1692 leap year starting on Tuesday!

No, if 277 AM was a leap year starting on Monday 1 AM was NOT a leap year starting on Monday, but a leap year starting on Tuesday. For September 1:st to be a Sunday, we need AM 1 to be a (theoretical) leap year starting on Monday (unless it could be as theoretical an ordinary year starting on Tuesday).

I think the Byzantine chronology and understanding of what date the world was created on has a problem if Gregorian calendar is more exact than Julian one in astronomy. Or rather, if the Gregorian calendar is exact.

Back before Pope Gregory XIII, the Gregorian dates are just theoretical, BUT back before Julius Caesar, the Julian dates are just theoretical too. Roman calendar before Caesar was a chaos, basically like recent Hebrew or Attic calendars, but ill entertained, not neatly according to Cycle of Meton.

This means that Gregorian calendar projects back astronomically. Can Byzantines solve this problem, or can I solve it for them? Stay tuned!

Hans Georg Lundahl
Nanterre UL
St Lorenzo Giustiniani
5.IX.2017

PS, had to correct html for first table, excuses to those seeing first version!