97th-octave temperaments: Difference between revisions

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Berkelium is a remarkable high-limit subgroup temperament with equally remarkable full 31-limit branchings. It is named after the 97th element, as it divides the octave into 97 equal parts.
{{Infobox fractional-octave|97}}
97th-octave temperaments occur between any equal divisions whose greatest common divisor is 97.


Berkelium comes in two variants, berkelium-247, named after the most stable isotope, is described as the 388 & 3395 temperament, of which [[388edo]] is consistent in the 37-odd-limit and [[3395edo]] is a zeta edo and a strong 19-limit tuning. Another 31-limit variety, named berkelium-247 is described as a 388 & 2619 temperament, and while [[2619edo]] is not remarkably strong in harmonic approximation, it is consistent in the 33-odd-limit, meaning it is natural for it to be temperament-merged with 388edo, and the end result is a 97th-octave temperament.
Although harmonic quality of 97edo is not visible at first glance, some of its multiples are highly notable large edos. [[388edo]] is the first edo to be consistent in the 37-odd-limit, [[3395edo]] is a zeta edo and a strong 19-limit tuning, having lowest 19-limit relative error than any division before it, and while [[2619edo]] is not remarkably strong in harmonic approximation, it is consistent in the 33-odd-limit.
== Berkelium ==
Berkelium is a remarkable high-limit subgroup temperament with equally remarkable full 31-limit branchings. It is named after the 97th element,
 
Berkelium comes in two variants, berkelium-247, named after the most stable isotope, is described as the 388 & 3395 temperament. Another 31-limit variety, named berkelium-248 is described as a 388 & 2619 temperament.


Different branchings of berkelium also map 1 step of 97edo to drastically different intervals, each of which could be used in a [[comma pump]]. Berkelium-247 maps the period in the higher limits to [[144/143]], the grossma.
Different branchings of berkelium also map 1 step of 97edo to drastically different intervals, each of which could be used in a [[comma pump]]. Berkelium-247 maps the period in the higher limits to [[144/143]], the grossma.
==Temperament data==
 
Subgroup: 2.3.5.13.17.23.29.31
Subgroup: 2.3.5.13.17.23.29.31


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Optimal tuning (CTE): ~3/2 = 701.9...
Optimal tuning (CTE): ~3/2 = 701.9...


Vals: 388, 2619, 3395...
{{Optimal ET sequence|legend=1|388, 2619, 3395}}...


=== Berkelium-248 ===
=== Berkelium-248 ===
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Optimal tuning (CTE): ~3/2 = 701.945
Optimal tuning (CTE): ~3/2 = 701.945


Vals: {{EDOs|388, 2619}}, ...
{{Optimal ET sequence|legend=1|388, 2619}}, ...


=== Berkelium-247 ===
=== Berkelium-247 ===
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Optimal tuning (CTE): ~3/2 = 701.976
Optimal tuning (CTE): ~3/2 = 701.976


[[Category:Rank 2]]
{{Navbox fractional-octave}}