# Talk:Cosmic Calendar

## WikiProject Time assessment rating comment

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
```
``` ==== 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
```
``` 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.
• 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)