The year we were born; the particular cycle around the sun, our unique place in the galaxy at the time and what went on in the unique particular container of "season" depending on area of residence: The season is literally akin to a quarantine area; creating a unique environment:
With a biofauna only present while trees have leaves on
Weatherwise (snow can make a major difference especially microbially) however also in insulating radiatively as can rainshowers of different frequency.
This means any particular year of individuals go through a similar series of alterations during the given year and of course the season would be relevant as well, however unlikely to be exactly the same during seasons across the years; especially due to the speed of communication, transference and interaction we experience as civilization has come to be.
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