Talk:Cosmic Calendar

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Might not need to be much more than a stub.

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—Yamara ✉  02:15, 16 February 2008 (UTC)

Inconsistent
The diagram and the given dates are inconsistent (e.g., multi-cellular life). Here are my calculations:

UNIVERSE -- Age = 13.75 billion years

COSMIC CALENDAR RATIOS (CCR) -- Years per Day    = 37671232.9 Years per Hour  = 1569634.7 Years per Minute = 26160.5784 Years per Second = 436.00964

COSMIC CALENDAR CALCULATIONS -- CCR Day    = 365 - (365 * t) / Universe Age CCR Hour  = 24 - (8760 * t) / Universe Age CCR Minute = 60 - (t / 26160.5784) CCR Second = 60 - (t / 436.00964)

MILKY WAY -- Age = 10 billion years CCR = 100 day, APR 10

SOLAR SYSTEM -- Age Sun   = 4.57 billion years Age Earth = 4.54 billion years CCR      = 244 day, SEP 1

LIFE -- Age = 3.4 billion years CCR = 275 day, OCT 2

EUKARYOTES -- Age = 2.2 billion years CCR = 307 day, NOV 3

SPONGES -- Age = 665 million years CCR = 347 day, DEC 13

FLATWORMS -- Age = 550 million years CCR = 350 day, DEC 16

http://en.wikipedia.org/wiki/File:FlatwormZICA.png

FISH -- Age = 510 million years CCR = 351 day, DEC 17

PLANTS -- Age = 425 million years CCR = 354 day, DEC 20

TETRAPODS -- Age = 375 million years CCR = 355 day, DEC 21

REPTILES -- Age = 320 million years CCR = 357 day, DEC 22

DINOSAURS -- Age = 230 million years CCR = 359 day, DEC 25

MAMMALS -- Age = 210 million years CCR = 359 day, DEC 25

BIRDS -- Age = 150 million years CCR = 361 day, DEC 27

EXTINCTION EVENT -- Age = 65.5 million years CCR = 363 day, DEC 29

PRIMATES -- Age = 60 million years CCR = 363 day, DEC 29

==== DEC 31 ==============================================================

APES -- Age = 29 million years CCR = 05:00

GREAT APES -- Age = 14 million years CCR = 15:00

EARLY HUMANS -- Age = 2.35 million years CCR = 22:00

STONE TOOLS -- Age = 1.76 million years CCR = 22:00

==== DEC 31, 23:00 =======================================================

SPEAR -- Age = 500000 years CCR = 23:41

FIRE -- Age = 400000 years CCR = 23:45

MODERN HUMANS -- Age = 195000 years CCR = 23:53

SPEECH -- Age = 150000 years CCR = 23:54

FLUTE -- Age = 35000 years CCR = 23:58 Link - http://news.bbc.co.uk/2/hi/science/nature/8117915.stm

==== DEC 31, 23:59 =======================================================

FIGURINE -- Age = 26000 years CCR = 23:59:00

BOW & ARROW -- Age = 25000 years CCR = 23:59:03

BOOMERANG -- Age = 23000 years CCR = 23:59:07

NEEDLE -- Age = 21000 years CCR = 23:59:12

POTTERY -- Age = 16000 years CCR = 23:59:23

JERICHO -- Age = 11000 years CCR = 23:59:35

AGRICULTURE -- Age = 10000 years CCR = 23:59:37

SMELTING -- Age = 8000 BCE CCR = 23:59:42

WRITING -- Age = 5500 BCE CCR = 23:59:47 Link - http://news.bbc.co.uk/2/hi/science/nature/334517.stm

WHEEL -- Age = 3500 BCE CCR = 23:59:52

PYRAMIDS -- Age = 2630 BCE CCR = 23:59:55

SCIENCE -- Age = 1600 BCE CCR = 23:59:56

PRINTING -- Age = 1440 CE; 572 years ago CCR = 23:59:59

Thangalin (talk) 01:00, 26 January 2012 (UTC)

Much thanks for checking up on this, sorry for the delay; I wasn't monitoring the talk page. The graphic dates had been pulled from a variety of sources. I revisited points of conflict in dates:


 * The galaxy date is based on formation of the disk we live in (8.8 bya). I'm not sure where you get 10 bya. Clarified the text to say "disk".


 * The solar system starts either at the very end of August or beginning of september, but I bumped it forward to september as you suggest since I think the graphic implied that it "fills" the month. This unfortunately requires stomping on the first life graphic.


 * Oldest fossils are 3.5 bya, but chemicals from life have been found going back 3.8 bya, so either way no change on first life in september.


 * I bumped eukaryotes from october since that's debatable and inserted photosynthesis instead, using a stromatolite for illustration. I kept multicellular life and sex in november, as this is the key outcome for eukaryotes, and the word eukaryote is technical and potentially off putting.


 * Added sponges and fish.


 * Moved reptiles 1 day earlier and eliminated amphibians due to ambiguity in fossil record

--Efbrazil (talk) 18:53, 16 February 2012 (UTC)

Purpose?
I'm a little unsure as to the purpose of this idea. Is it simply to help humans conceptualize the vast spans of time in Cosmology?

Something to this effect should be added to the article by somebody who actually knows anything about this. Lesmothian (talk) 19:37, 6 November 2009 (UTC)

Who invented this scale?
It would be interesting to give this information in the article. Was Sagan the inventor or just the main "popularizer"? —Preceding unsigned comment added by 87.219.165.19 (talk) 09:28, 10 November 2010 (UTC)

classical music
Around 1750, Franz Josef Haydn establishes and popularizes new forms of musical expression from which practically all structured later classical music descend. The break between baroque and rococo music is huge. Pbrower2a (talk) 03:07, 24 April 2015 (UTC)

Why is Haydn etc. even mentioned in a page about the chronology of the Universe? He's a great composer, I suppose, but still? More to the point, why is this article a random collection of links in an apparent attempt to compile a "Cosmic Calendar" instead of an actual article about the concept of "Cosmic Calendar" as employed by Sagan and others? I thought we had Wikibooks precisely for such purposes. --dab (𒁳) 12:14, 15 May 2016 (UTC)

Ref #1 doesn't direct anywhere
The first reference about the Cosmic Calendar that is apparently supposed to be an "activity" (according to the URL), gives a 404. — Preceding unsigned comment added by 210.55.200.172 (talk) 22:28, 22 June 2016 (UTC)

External links modified (January 2018)
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Year 3+ section
Propose deleting this section as it is highly subjective, doesn’t cite sources and once you get into cosmological years written in as powers of 10 it ceases to fulfil the stated purpose of making the scale intuitive. Btljs (talk) 20:29, 19 October 2021 (UTC)