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could we add that it is sometimes written with the greek symbol μ mu ? Olivier --134.130.140.116 11:22, 3 March 2006 (UTC)

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nonsense removed

I removed this uncited dubious entry, because it made no sense ("a fifth"... of what?)

• 4.63 microseconds – a fifth (a 60th of a 60th of a 60th of a second)

feel free to work out what it was supposed to mean, and put it back fixed.

I also removed this;

• 277.8 microseconds – a fourth (a 60th of a 60th of a second), used in astronomical calculations by al-Biruni and Roger Bacon in 1000 and 1267 AD, respectively.

which is also nonsense, and the references did not appear to support it either ("fourth" (and, for that matter, "fifth") were not used in the context of seconds, and every time they were used, it was hyphenated, like "fourth-part", in the context of an actual sentence explaining what it was a part of.

In reply to User:120.151.160.158 who removed the bits about "fourth" and "fifth" -- I am pretty sure it means 277.8 μs is the result of dividing an hour by 60, four times, or 277.8 = 1 hour / (60 ^ 4). Likewise 4.63 μs = 1 hour / (60 ^ 5). From looking at the Google Books version of the al-Biruni book, I also realized that this follows a logical progression from "seconds" and also explains why one abbreviation for seconds is two little apostrophes. If you will, hour = zeroth. Minute = first. Second = second. 16.667 ms = third. 277.8 μs = fourth. 4.63 μs = fifth. Furthermore, Sexagesimal says 'Until at least the 18th century, 1/60 of a second was called a "tierce" or "third".' Some references are given. I believe that 1 μs is something like 12 sixths, 57 sevenths, 36 eighths.

Despite figuring this out, I'm not sure how to work this back in to the article. --Officiallyover (talk) 17:05, 2 September 2015 (UTC)

probably should be defined better on the Second#Based_on_subdivisions_of_the_moon_cycle article and linked to that Alanbelllibertus (talk) 15:03, 23 January 2017 (UTC)

References

1. al-Biruni (1879). The chronology of ancient nations: an English version of the Arabic text of the Athâr-ul-Bâkiya of Albîrûnî, or "Vestiges of the Past". translated by Sachau C Edward. W.H. Allen. pp. 147–149. OCLC 9986841.
2. R Bacon (2000) . The Opus Majus of Roger Bacon. translator: BR Belle. University of Pennsylvania Press. table facing page 231. ISBN 978-1-85506-856-8. {{cite book}}: Unknown parameter |nopp= ignored (|no-pp= suggested) (help)

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