1701/1700, the palingenetic comma, also known as the palingenesis, or palingenesma, is a 17-limit unnoticeable comma with a size of roughly 1.02 cents. It identifies the septendecimal submajor third (21/17) by a stack of two 10/9 intervals, therefore making it comparable with the marveltwin (325/324). It is, in fact, the difference between the tannisma and the marveltwin. See #Commatic relations below. It also arises as the amount by which a stack consisting of 27/16 and 28/25 exceeds 17/9.
This comma is the difference between the following superparticular pairs:
- 81/80 and 85/84
- 126/125 and 136/135
- 273/272 and 325/324
- 351/350 and 442/441
- 441/440 and 595/594
- 936/935 and 2080/2079
- 1089/1088 and 3025/3024
- 1225/1224 and 4375/4374
It factors into the following superparticular pairs:
When tempered out in the full 17-limit, the resulting temperament is called the palingenetic temperament, or in the 18.104.22.168.17 subgroup, the palingenetian temperament. Both are characterized by the presence of essentially tempered chords called palingenetic chords in the 21- and 27-odd-limit.
This comma was named by Aura in 2020. Its names ultimately come from the Ancient Greek word palingenesía ("rebirth", "regeneration" or "renaissance"), a fitting name since people often hope for a new start after each year. The name is also appropriate in light of how certain essentially tempered chords generated by this comma are evocative of the kinds of chords heard in 12edo, which, oddly enough, actually tempers out this comma.