Semicomma: Difference between revisions

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The '''semicomma''' or '''Fokker comma''' ([[ratio]]: 2109375/2097152, [[monzo]]: {{monzo| -21 3 7 }}), is ~~an interval~~ of 10.061 [[cent]]s which is the amount by which three classic augmented second intervals of [[75/64]] exceed [[8/5]]. That means (75/64)3/(8/5), which can also be written ((9/8)(25/24))3/(8/5). In terms of commas, it factors into simpler commas as ([[15625/15552]])([[32805/32768]]), the kleisma and the schisma. Tempering it out leads to [[orson]] temperament.

{{Infobox Interval

| Ratio = 2109375/2097152

| Name = semicomma, orson comma, Fokker's comma

| Color name = Ly7-3, Lasepyo comma

| Comma = yes

}}

The '''semicomma''' or '''Fokker's comma''' ([[ratio]]: 2109375/2097152, [[monzo]]: {{monzo| -21 3 7 }}), is a [[small comma|small]] [[5-limit]] [[comma]] of 10.061 [[cent]]s which is the amount by which three classic augmented second intervals of [[75/64]] exceed [[8/5]]. That means (75/64)3/(8/5), which can also be written ((9/8)(25/24))3/(8/5). In terms of commas, it factors into simpler commas as ([[15625/15552]])([[32805/32768]]), the kleisma and the schisma. It is also the difference between the [[31-comma]] ({{nowrap|331/249}}) and seven syntonic commas ([[81/80]]).

== Temperaments ==

[[Tempering out]] this comma in the 5-limit leads to the [[orson]] temperament.

== Name ==

Given the other intervals called "semicomma", it is likely that "semicomma" refers to the comma's size as about half the size of the syntonic comma. The name "Fokker's comma" comes from [[Adriaan Fokker]].

== See also ==

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* Semicomma majeur, aka [[15625/15552|kleisma]]

~~[[Category:5-limit]]~~

~~[[Category:Small commas]]~~

[[Category:Orson]]

[[Category:Commas with unknown etymology]]

[[Category:Commas named after composers]]

[[Category:Commas named after music theorists]]

{{Todo|add etymology|comment=Explain the reasoning behind the name "semicomma". Why is 2109375/2097152 uniquely deserving of the name?}}

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-The '''semicomma''' or '''Fokker comma''' ([[ratio]]: 2109375/2097152, [[monzo]]: {{monzo| -21 3 7 }}), is an interval of 10.061 [[cent]]s which is the amount by which three classic augmented second intervals of [[75/64]] exceed [[8/5]]. That means (75/64)<sup>3</sup>/(8/5), which can also be written ((9/8)(25/24))<sup>3</sup>/(8/5). In terms of commas, it factors into simpler commas as ([[15625/15552]])([[32805/32768]]), the kleisma and the schisma. Tempering it out leads to [[orson]] temperament.
+{{Infobox Interval
+| Ratio = 2109375/2097152
+| Name = semicomma, <br>orson comma, <br>Fokker's comma
+| Color name = Ly<sup>7</sup>-3, Lasepyo comma
+| Comma = yes
+}}
+The '''semicomma''' or '''Fokker's comma''' ([[ratio]]: 2109375/2097152, [[monzo]]: {{monzo| -21 3 7 }}), is a [[small comma|small]] [[5-limit]] [[comma]] of 10.061 [[cent]]s which is the amount by which three classic augmented second intervals of [[75/64]] exceed [[8/5]]. That means (75/64)<sup>3</sup>/(8/5), which can also be written ((9/8)(25/24))<sup>3</sup>/(8/5). In terms of commas, it factors into simpler commas as ([[15625/15552]])([[32805/32768]]), the kleisma and the schisma. It is also the difference between the [[31-comma]] ({{nowrap|3<sup>31</sup>/2<sup>49</sup>}}) and seven syntonic commas ([[81/80]]).
+== Temperaments ==
+[[Tempering out]] this comma in the 5-limit leads to the [[orson]] temperament.
+== Name ==
+Given the other intervals called "semicomma", it is likely that "semicomma" refers to the comma's size as about half the size of the syntonic comma. The name "Fokker's comma" comes from [[Adriaan Fokker]].
 == See also ==
@@ Line 7: / Line 19: @@
 * Semicomma majeur, aka [[15625/15552|kleisma]]
-[[Category:5-limit]]
-[[Category:Small commas]]
 [[Category:Orson]]
+[[Category:Commas with unknown etymology]]
+[[Category:Commas named after composers]]
+[[Category:Commas named after music theorists]]
+{{Todo|add etymology|comment=Explain the reasoning behind the name "semicomma". Why is 2109375/2097152 uniquely deserving of the name?}}