# 524edo

← 523edo | 524edo | 525edo → |

^{2}× 131The **524 equal divisions of the octave (524edo)**, or **524(-tone) equal temperament (524-tet, 524et)** when viewed from a regular temperament perspective, divides the octave into 524 equal parts of about 2.29 cents each.

## Theory

Harmonic | 3 | 5 | 7 | 9 | 11 | 13 | 15 | 17 | 19 | 21 | |
---|---|---|---|---|---|---|---|---|---|---|---|

Error | absolute (¢) | +1.10 | +0.71 | -0.12 | -0.09 | +0.59 | -0.07 | -0.48 | +0.39 | +0.20 | +0.97 |

relative (%) | +48 | +31 | -5 | -4 | +26 | -3 | -21 | +17 | +9 | +43 | |

Steps (reduced) |
831 (307) |
1217 (169) |
1471 (423) |
1661 (89) |
1813 (241) |
1939 (367) |
2047 (475) |
2142 (46) |
2226 (130) |
2302 (206) |

524edo is excellent in the 2.7.13.19 subgroup, and good in the no-threes 19-limit. In the 3-limit, it is wise to treat 524edo as a dual-fifth system. The minor fifth, 306\524 reduces to 153\262, as such, on this val 524edo is contorted.

524 years is the length of a calendar leap week cycle with 93 leap weeks, creating a 93 out of 524 maximum evenness scale with the generator 293\524, represented by the 93 & 524 temperament.

In addition, both 93 and 524 represent well the 13:17:19 harmonics. The corresponding comma list in the 2.7.13.17.19 subgroup is 16807/16796, 157339/157216, 47071232/47045881. Eliora proposes that this temperament be named **ostara**, after the feast of the spring equinox, which 93\524 leap week rule approximates well. Other spring equinoctial temperaments, such as 41 & 231 (Dee leap week), 97 & 400 (Gregorian leap day), and 52 & 293 (Sym454) already have their identities and names.

The generator 293\524 represents the 28/19 interval in the 2.7.19 subgroup and it serves as ostara's generator in the no-threes 19-limit. Being around 671 cents, can also be used to as a generator for mavila or pelog.

In the 13-limit, 524edo tempers out 1001/1000 and 6664/6655.

## Scales

- Ostara[7]: 62 62 62 107 62 62 107 - 2L 5s

## Regular temperament properties

Based on treating 524edo as a no-threes system:

Subgroup | Comma list | Mapping | Optimal 8ve stretch (¢) |
Tuning error | |
---|---|---|---|---|---|

Absolute (¢) | Relative (%) | ||||

2.5 | [1217 -524⟩ | [⟨524 1217]] | -0.152 | 0.153 | 6.67 |

2.5.7 | [33 -13 -1⟩, [-4 -43 37⟩ | [⟨524 1217 1471]] | -0.087 | 0.155 | 6.79 |

2.5.7.11 | 1835008/1830125, [3 7 3 -8⟩, [-13 -5 10 -1⟩ | [⟨524 1217 1471 1813]] | -0.108 | 0.139 | 6.09 |

2.5.7.11.13 | 1001/1000, 742586/741125, 2097152/2093663, 14201915/14172488 | [⟨524 1217 1471 1813 1939]] | -0.082 | 0.135 | 5.88 |

2.5.7.11.13.17 | 1001/1000, 6664/6655, 54080/54043, 147968/147875, 285719/285610 | [⟨524 1217 1471 1813 1939 2142]] | -0.084 | 0.122 | 5.37 |