Talk:The Sand Reckoner

message: :The resulting estimate is that the radius of the universe is about one light year which is consistent with current estimates for the radius of the solar system. Archimedes' final estimate gives an upper bound of 1064 for the number of grains of sand in a filled universe.
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It would be interesting to have an estimate of the actual number of grains that would fit in a one-light-year universe.  — Johan the Ghost seance 04:55, 26 August 2006 (UTC)
thread_title:  Accuracy? 

message: I've not seen the estimate of 10^14 stadia for the diameter of Archimede's universe reinforced elsewhere: a more common number thrown about seems to be 10^9 stadia, which doesn't even encompass the majority of our solar system.
Haven't changed anything -- I'm not sure if my references are worth citing -- but I'm bringing attention to the discrepancy  —Preceding unsigned comment added by 196.2.161.80 (talk) 19:24, 13 September 2007 (UTC)
replies: text: As Archimedes explains in The Sand Reckoner, he uses the term universe (Greek: κόσμος) to denote a sphere whose radius is equal to the distance of the Earth from the Sun.  He estimates the diameter of this sphere to be no more than 1010 stadia.  In the heliocentric model he is using, however, the fixed stars are much further away from the Sun than the Earth is, so this sphere does not encompass everything observable.  The much larger sphere of the fixed stars, which is estimated to have diameter no more than 1014 stadia, is the only sphere which can encompass everything observable, so it is the sphere which fits the modern usage of the word universe.  Spacepotato 19:43, 13 September 2007 (UTC)
thread_title:  Universe size? 

message: Could someone add a reference to an explanation of this system?  The only page that turned up with this phrase when I Googled it was this one.  It sounds interesting, but right now the notation is totally unclear. 68.170.182.217 (talk) 09:09, 31 December 2010 (UTC)
replies: text: @ 179.190.227.20 (talk) 16:21, 1 August 2023 (UTC)
thread_title:  Boice Numero-Linguistic Model of Number Naming 

message: And just how many grains of sand are there in the universe? Surely in the last 2000 years somebody else must have estimated this. It would be good to see how far out he was.  — Preceding unsigned comment added by 88.209.111.210 (talk) 17:12, 30 June 2012 (UTC)
replies: text: Archimedes discussed how many grains of sand it would take to fill the universe... AnonMoos (talk) 07:56, 13 January 2013 (UTC)
thread_title:  Correct result would be useful 

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thread_title:  External links modified