Chapters
12 The Great-Great-Year

Why is the Great-Great-Year 305,760 years?

All Earth movements are coming together in the Great-Great-Year cycle of 305,760 years.

First of all, off course, I do not know WHY the length of a Great-Great-Year is 305,760 years. I only know this is a number which fits. Therefore the why part is unknown. Let’s really focus on the part HOW I came to this number?

Initial inspiration

As mentioned in chapter 3 the idea of a connection between all lengths of years and precession cycles originates from this paper (opens in a new tab). It shows the precession cycles might be more or less connected (1/25,770 – 1/68,000 ≈ 1/41,000). This was revolutionary information to me and thinking about it, it made a lot of sense. If it was just random numbers working against each other, it would be instable and if it was instable, we would not have been here.

I had already an Excel with the current length of days and years so initially I started all calculations based upon the current duration of apsidal precession of 20,934 years which caused a duration of the Great-Great-Year of 334,944 years. This number is however not correct because it is an experienced length and not a real length.

The length of the Great-Great-Year is based upon the following four factors:

  1. All planets orbits are aligned in a Great-Great-Year

    After the initial inspiration, my reasoning was this length cannot only just apply to the length of Earth precession cycles but must also apply to all other solar system bodies. So I added all numbers of planet orbits and tried to make the model as complete as it could be. In order to align the orbits with the observations however, the number of planet orbits in 334,944 years ended up with broken numbers. Initially I didn’t mind, as long as the model would fit with the observations. As a result my Excel became quite mature so I was able to have all calculations based upon only a few input numbers. That definitively helped me in the end.

  2. Around year 1246 AD the solstice needs to be aligned with the perihelion

    We know the longitude of perihelion (opens in a new tab) value was ~102.94719° and we know the last time the aphelion/ perihelion was on the same date as the solstices, was around year 1246 AD. According to J. Meeus, on 14th of December 1246 AD, winter solstice was in line with the aphelion. See e.g. this Wikipedia page about the equation of time (opens in a new tab) or this EarthSky article (opens in a new tab).

    Therefore we can come to the conclusion the apsidal precession grew with ~12.94719° since 1246 till the start of the 3D model 21 June 2000 12:00 UTC.

    The value of the longitude of perihelion with the formula’s provided by J. Meeus is used as input.

    This value is however based upon the two motions working against each other: The Axial precession is moving clockwise and the Inclination precession is moving counter clockwise.

    So the result of these two motions is described in the formula of J. Meeus. The actual movements are different. In the 3D model, the only number that fits the formula of the longitude of the perihelion – like observed – needs to be around a Great-great-year length of ~305k.

  3. Moon orbits are aligned in a Great-Great-Year

    The last piece of the puzzle is the Moon needs to comply to the Great-Great-Year length of 305,760 years.

    In the Excel TAB ”Chapter 3-4-5-6-7-8-9” starting with cell P163 the Moon settings are set in the model

    • Cell P163 shows the Moon’s Apsidal Precession value
    • Cell S163 shows the Moon’s Royer Cycle value
    • Cell T163 shows the Moon’s Nodal precession value
    • Cell U163 shows the Moon’s Sidereal month value

    All Moon cycles additionally are based on divisors of the Great-Great-Year.

  4. Climate cycles

    This picture I found on the internet and shows the temperature in the past. You can find it on a lot of the same kind of pictures on all sort of websites. This one particularly is coming from data collected from the Vostok Ice Core.

    Below similar picture shows the temperature variations for the last 450 thousand years on Antarctica and can also be found on a lot of websites (opens in a new tab).

    In both pictures you can see a pattern commonly acknowledged as ~100k years.

    My translation would be, we need to see a 3 * ~100k = ~300k year cycle coming back in the length of the Great-Great-Year.

The only Great-Great-Year possible has a duration of 305,760 years

In the end I had to let go of my initial numbers and came to a length of the Great-Great-Year of 305,760 years.

The length of 305,760 years is the ONLY GREAT-GREAT-YEAR LENGTH that combines the last time perihelion/ solstice were alignment in 1246 AD, the progressing of the longitude of the perihelion, the length of the precession cycles and the duration of the orbital period of all major planets and Moon and what is shown on historic temperature graphs.

The Excel has more background information. There is a TAB called “Chapter 2” in the Excel that gives all above mentioned numbers.

Let’s focus on what we are orbiting in the next chapter.