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Unread 10-23-2020, 04:56 PM
Senior Member
Join Date: Jan 2008
Posts: 73,685
Re: Jupiter Saturn Conjunction 2020


Jupiter's alignment with Saturn
occurs at intervals of just under 20 years
The aspect is occasionally repeated due to a retrograde
of one or both planets.
Each successive conjunction
not counting retrograde repeats
occurs at a mean advance of
approximately 243 degrees relative to its predecessor
although from one alignment to the next
this arc can vary considerably.

Every third conjunction
once every 60 years
brings the alignment back
to its starting place, plus around 9 degrees:
this 60 year cycle is termed
FIRST ORDER RECURRENCE of the conjunction.

Every 40th conjunction - roughly once every 800 years -
brings the alignment back to within about 1 degree of its starting place:
this approximate 800 year cycle is termed SECOND ORDER RECURRENCE

Jupiter and Saturn may both be regarded as generational planets
Jupiter takes 12 years to orbit Sun
Saturn takes 30 years to orbit Sun
- additionally, during their respective orbits of the Sun
Jupiter and Saturn are in conjunction only approximately every 20 years.

These specific spans of time

chime well with the accepted idea of “a generation”
being the span of time necessary before human beings are physically able
to produce a child of their own
in human terms, 'a generation' can be a variable
- that's because some produce offspring very early
and in many 'eastern' countries before their teens.

However, in 'the west' there is a tendency to initially focus on 'career'
before then producing offspring later in the 30's.
The middle ground would be those producing offspring in their 20's.
Based on those rather "rough and ready" spans of time then:

(1) A twelve year Jupiter orbit of the sun represents

those who are parents at an age considered in 'the west'
very young - i.e. 12

(2) A thirty year Saturn orbit of the sun represents

those who are parents at what is considered in 'the west'
to be a 'more responsible age' - i.e. 30

(3) A combination of the two planets in regular 20 year Jupiter-Saturn conjunctions

then represent the 'middle-ground' - i.e. 19/20

USUALLY a generation
averages about 25 years from the birth of a parent to the birth of a child
- although it varies case by case
it is generally accepted that the length of a generation
was closer to 20 years in earlier times
when humans mated younger
and life expectancies were shorter

Among present-day members

of a contemporary hunter-gatherer people
of Botswana and Namibia
whose lifestyle is relatively similar
to that of our Western pre-agricultural ancestors
the average age of mothers
at the birth of their first child was 20 years
and at the last birth 31
giving a mean of 25.5 years per female generation
which is considerably above the 20 years
commonly attributed to 'primitive cultures'.
Fathers were six to 13 years older than mothers
giving a male generational interval of 31 to 38 years.
(source: sociologist Nancy Howell)

population geneticists Marc Tremblay and Hélène Vézina

found a generational interval, based on the years between parents’ and children’s marriages
to average 31.7 years
they determined that male generations averaged 35.0 years
while female generations averaged 28.7 years.
(source: 100 ascending Quebec genealogies)

A separate study by Biological anthropologist Agnar Helgason and colleagues
who used the Icelandic deCODE genetics database
to arrive at a female line interval of 28.12 years for the most recent generations
and 28.72 years for the whole lineage length.
Male line lineages showed a similar difference
—31.13 years for the recent generations
and 31.93 years overall.

For a more mathematically appealing average then

Helagason and fellow researchers recommended
estimating female generational line intervals at 30 years
and male generational intervals at 35 years
- based on the Quebec and Iceland studies.

We need to keep in mind
that current understandings in physical and biological sciences
are subject to change
as more data becomes available
and that data’s interpretation becomes more certain.

So, for now
when genealogists want to convert generations to years
and create probable date ranges, using an evidence-based generational interval
such as Helagason’s 30 and 35 years
- or even one developed based on your own family history research
may be the best solution.

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