SolSeed Cosmic Calendar
I loved Sagan's Cosmic Calendar when I was a kid. It was a big step forward in terms of being awed by the immensity of time and showing us, as humanity, our place in the history of the universe.
But it does contain one major flaw: it places this moment in time at the end of the story. This gives the impression that humanity is the culmination of the story, which is rather anti-Copernican. Neil deGrasse Tyson's new Cosmos includes a brief sequence describing a second "cosmic year," extending 13.8 billion years into the future, but this is basically arbitrary, placing the present moment at the exact center of a 27.6-billion-year timeline.
The problem is that science has failed so far to establish a set value for the duration of the universe. Big Rip or Big Freeze, the fate of the universe is not even established yet and the duration could be infinite. This makes it difficult to set the whole timeline (past, present and future) to scale into a year.
It is an interesting thought experiment to try though. Set the end of time out around the time of last star burn out, about 100 trillion years from now. This means the future is 10 000 times longer than the past. Scaling such a model onto a year which begins at the moment of winter solstice, the entire 14 billion year history of the universe will be celebrated in the first five minutes after the solstice leaving the rest of the year to celebrate our immense future.
However, we revere the past part of the story too much to limit our celebration and contemplation of it to 5 minutes. So instead the SolSeed Movement has abandoned scale and instead divided the year into eight thematic chapters called Liturgical Seasons that cover what is important to us:
Early winter we call Genesis : birth of the universe through to the oxygen crisis. We revere Life above all else and so the pre-Life universe gets compressed into a couple of weeks.
Late Winter we call Conflatorium : the melting, the evolution of complex Life as Ice Ball Earth melts.
Early Spring we call Viriditas de Terra : the greening of the Earth : the evolution of trees so critical to the diversity of Life on land.
Late Spring we call Diversitas : the Diversification of Life. In reality, it overlaps the last two seasons but it is an important concept and deserves a season to be recognized.
Early Summer we call Sophos : Wisdom and represents the evolution of intelligence.
Late Summer we call Civis and represents the human story as we learn and develop and find our way to serving Gaia and helping her to reach her goals of spreading and flowering.
Early Fall is Viventibus Mundos : Living worlds. it is the celebration of Life spreading to other worlds in the future.
Late Fall is Viventibus Galaxia : Living Galaxies. It represents the flowering of Life across galaxies in the far future.