Arcturus: Difference between revisions
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{{ | '''Arcturus''' is the [[non-octave]] [[rank]]-2 [[regular temperament]] of the 3.5.7 [[subgroup]] that [[tempering out|tempers out]] the arcturus comma, [[15625/15309]]. Having an ~[[5/3]] as a generator, this temperament is the application of the [[Pythagorean]] principle of tuning a stack of the next higher prime number and then factoring out powers of the equivalence to [[tritave]] composition. However, a heptatonic {{mos scalesig|2L 5s<3/1>|link=1}} [[MOS]] will not suffice to produce an understandable rendition of it because a very close ~5/3 generates a L:s ratio between 4:1 and 5:1, which is beginning to get too lopsided to still be a complete presentation of a temperament. | ||
{{tdlink|No-twos subgroup temperaments #Arcturus}} | |||
== Etymology == | |||
This temperament is named after the star {{w|Arcturus}}, following a series of non-octave temperaments that are named after stars. | |||
{{todo|add etymology|inline=1|text=Add name (person who coined the term) and year (when it was coined).}} | |||
== Chords == | == Chords == | ||
Arcturus contains the triad 5:7:9 (used in [[ | Arcturus contains the triad 5:7:9 (used in [[Bohlen–Pierce]] harmony) and the triad 27:35:45 which divides 5/3 into two nearly-equal parts. | ||
== Tuning spectrum == | == Tuning spectrum == | ||
Below is a list of MOS families which present it completely (however smearily) using a generator of 845.3 to 951.0 | Below is a list of MOS families which present it completely (however smearily) using a generator of 845.3 to 951.0{{c}}: | ||
{| class="wikitable" | {| class="wikitable" style="text-align: center;" | ||
|- | |- | ||
! colspan="7" | Generator | ! colspan="7" | Generator | ||
! | ! Cents<br>Hekts | ||
! L | |||
! | ! s | ||
! | ! 2g | ||
! | ! Notes | ||
! | |||
|- | |- | ||
| 6\13 | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 877.825<br>600 | |||
600 | | 146.304<br>100 | ||
| 0 | |||
100 | | 1755.651<br>1200 | ||
| {{nowrap|L {{=}} 1|s {{=}} 0}} | |||
1200 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 43\93 | |||
| 879.399<br>601.075 | |||
601.075 | | 143.158<br>97.8495 | ||
| 20.451<br>13.9785 | |||
97.8495 | | 1758.797<br>1202.151 | ||
| {{nowrap|L {{=}} 7|s {{=}} 1}} | |||
13.9785 | |||
1202.151 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 37\80 | |||
| | |||
| 879.654<br>601.25 | |||
601.25 | | 142.647<br>97.5 | ||
| 23.774<br>16.25 | |||
97.5 | | 1759.38<br>1202.5 | ||
| {{nowrap|L {{=}} 6|s {{=}} 1}} | |||
16.25 | |||
1202.5 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 68\147 | |||
| 879.816<br>601.3605 | |||
601.3605 | | 142.323<br>97.279 | ||
| 25.877<br>17.687 | |||
97.279 | | 1759.632<br>1202.721 | ||
| | |||
17.687 | |||
1202.721 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| 31\67 | |||
| | |||
| | |||
| 880.009<br>601.4925 | |||
601.4925 | | 141.937<br>97.015 | ||
| 28.387<br>19.403 | |||
97.015 | | 1760.081<br>1202.985 | ||
| {{nowrap|L {{=}} 5|s {{=}} 1}} | |||
19.403 | |||
1202.985 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 87\188 | |||
| 880.16<br>601.596 | |||
601.596 | | 141.634<br>96.8085 | ||
| 30.35<br>20.745 | |||
96.8085 | | 1760.32<br>1203.191 | ||
| | |||
20.745 | |||
1203.191 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 56\121 | |||
| | |||
| 880.243<br>601.653 | |||
601.653 | | 141.468<br>96.694 | ||
| 31.437<br>21.488 | |||
96.694 | | 1760.487<br>1203.306 | ||
| | |||
21.488 | |||
1203.306 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 81\175 | |||
| 880.3335<br>601.714 | |||
601.714 | | 141.288<br>96.571 | ||
| 32.605<br>22.286 | |||
96.571 | | 1760.667<br>1203.429 | ||
| | |||
22.286 | |||
1203.429 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| 25\54 | |||
| | |||
| | |||
| | |||
| 880.535<br>601.852 | |||
601.852 | | 140.886<br>96.296 | ||
| 35.221<br>24.074 | |||
96.296 | | 1761.069<br>1203.704 | ||
| {{nowrap|L {{=}} 4|s {{=}} 1}} | |||
24.074 | |||
1203.704 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 94\203 | |||
| 880.708<br>601.97 | |||
601.97 | | 140.5385<br>96.059 | ||
| 37.477<br>25.616 | |||
96.059 | | 1761.4165<br>1203.971 | ||
| | |||
25.616 | |||
1203.971 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 69\149 | |||
| | |||
| 880.711<br>602.013 | |||
602.013 | | 140.413<br>95.973 | ||
| 38.294<br>26.1745 | |||
95.973 | | 1761.542<br>1204.027 | ||
| | |||
26.1745 | |||
1204.027 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 113\244 | |||
| 880.823<br>602.049 | |||
602.049 | | 140.308<br>95.902 | ||
| 38.9745<br>26.639 | |||
95.902 | | 1761.647<br>1204.098 | ||
| | |||
26.639 | |||
1204.098 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| 44\95 | |||
| | |||
| | |||
| 880.9055<br>602.105 | |||
602.105 | | 140.144<br>95.7895 | ||
| 40.041<br>27.368 | |||
95.7895 | | 1761.811<br>1204.2105 | ||
| {{nowrap|L {{=}} 7|s {{=}} 2}} | |||
27.368 | |||
1204.2105 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 107\231 | |||
| 880.992<br>602.1645 | |||
602.1645 | | 139.971<br>95.671 | ||
| 41.168<br>28.1385 | |||
95.671 | | 1761.984<br>1204.329. | ||
| | |||
28.1385 | |||
1204.329. | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 63\136 | |||
| | |||
| 881.053<br>602.206 | |||
602.206 | | 139.85<br>95.588 | ||
| 41.955<br>28.6765 | |||
95.588 | | 1762.105<br>1204.412 | ||
| | |||
28.6765 | |||
1204.412 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 82\177 | |||
| 881.132<br>602.26 | |||
602.26 | | 139.692<br>95.48 | ||
| 42.982<br>22.034 | |||
95.48 | | 1762.263<br>1204.52 | ||
| | |||
22.034 | |||
1204.52 | |||
|- | |- | ||
| | |||
| | |||
| 19\41 | |||
| | |||
| | |||
| | |||
| | |||
| 881.394<br>602.439 | |||
602.439 | | 139.167<br>95.122 | ||
| 46.389<br>31.707 | |||
95.122 | | 1762.788<br>1204.878 | ||
| {{nowrap|L {{=}} 3|s {{=}} 1}} | |||
31.707 | |||
1204.878 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 89\192 | |||
| 881.635<br>602.604 | |||
602.604 | | 138.684<br>94.792 | ||
| 49.53<br>33.854 | |||
94.792 | | 1763.271<br>1205.208 | ||
| | |||
33.854 | |||
1205.208 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 70\151 | |||
| | |||
| 881.701<br>602.649 | |||
602.649 | | 138.553<br>94.702 | ||
| 50.383<br>25.828 | |||
94.702 | | 1763.402<br>1205.298 | ||
| | |||
25.828 | |||
1205.298 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 121\261 | |||
| 881.794<br>602.682 | |||
602.682 | | 138.4565<br>89.655 | ||
| 51.01<br>34.866 | |||
89.655 | | 1763.4985<br>1205.362 | ||
| | |||
34.866 | |||
1205.362 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| 51\110 | |||
| | |||
| | |||
| 881.8155<br>602.727 | |||
602.727 | | 138.324<br>94.5455 | ||
| 51.8715<br>35.4545 | |||
94.5455 | | 1763.631<br>1205.4545 | ||
| | |||
35.4545 | |||
1205.4545 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 134\289 | |||
| 881.875<br>602.768 | |||
602.768 | | 138.204<br>94.464 | ||
| 52.649<br>35.986 | |||
94.464 | | 1763.751<br>1205.536 | ||
| | |||
35.986 | |||
1205.536 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 83\179 | |||
| | |||
| 881.912<br>602.793 | |||
602.793 | | 138.131<br>94.413 | ||
| 53.172<br>36.313 | |||
94.413 | | 1763.824<br>1205.586 | ||
| | |||
36.313 | |||
1205.586 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 115\248 | |||
| 881.955<br>602.823 | |||
602.823 | | 138.045<br>94.355 | ||
| 53.684<br>36.6935 | |||
94.355 | | 1763.91<br>1205.645 | ||
| | |||
36.6935 | |||
1205.645 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| 32\69 | |||
| | |||
| | |||
| | |||
| 882.066<br>602.899 | |||
602.899 | | 137.823<br>94.203 | ||
| 55.129<br>37.681 | |||
94.203 | | 1764.132<br>1205.797 | ||
| {{nowrap|L {{=}} 5|s {{=}} 2}} | |||
37.681 | |||
1205.797 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 109\235 | |||
| 882.183<br>602.979 | |||
602.979 | | 137.588<br>94.043 | ||
| 56.654<br>38.723 | |||
94.043 | | 1764.367<br>1205.957 | ||
| | |||
38.723 | |||
1205.957 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 77\166 | |||
| | |||
| 882.232<br>603.012 | |||
603.012 | | 137.491<br>93.976 | ||
| 57.288<br>39.157 | |||
93.976 | | 1764.464<br>1206.024 | ||
| | |||
39.157 | |||
1206.024 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 122\263 | |||
| 882.276<br>603.042 | |||
603.042 | | 137.404<br>93.916 | ||
| 57.854<br>39.544 | |||
93.916 | | 1764.551<br>1206.084 | ||
| | |||
39.544 | |||
1206.084 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| 45\97 | |||
| | |||
| | |||
| 882.35<br>603.093 | |||
603.093 | | 137.2545<br>93.814 | ||
| 58.823<br>40.206 | |||
93.814 | | 1764.7005<br>1203.185 | ||
| {{nowrap|L {{=}} 7|s {{=}} 3}} | |||
40.206 | |||
1203.185 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 103\222 | |||
| 882.439<br>603.153 | |||
603.153 | | 137.078<br>93.694 | ||
| 59.972<br>40.991 | |||
93.694 | | 1764.877<br>1206.306 | ||
| | |||
40.991 | |||
1206.306 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 58\125 | |||
| | |||
| 882.507<br>603.2 | |||
603.2 | | 136.941<br>93.6 | ||
| 60.863<br>41.6 | |||
93.6 | | 1765.014<br>1206.4 | ||
| | |||
41.6 | |||
1206.4 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 71\153 | |||
| 882.607<br>603.268 | |||
603.268 | | 136.742<br>93.464 | ||
| 62.155<br>42.484 | |||
93.464 | | 1765.213<br>1206.536 | ||
| | |||
42.484 | |||
1206.536 | |||
|- | |- | ||
| | |||
| 13\28 | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 883.0505<br>603.571 | |||
603.571 | | 135.854<br>92.857 | ||
| 67.93<br>46.429 | |||
92.857 | | 1766.101<br>1207.143 | ||
| {{nowrap|L {{=}} 2|s {{=}} 1}} | |||
46.429 | |||
1207.143 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 72\155 | |||
| 883.489<br>603.871 | |||
603.871 | | 134.9775<br>92.258 | ||
| 73.624<br>50.323 | |||
92.258 | | 1766.9775<br>1207.742 | ||
| | |||
50.323 | |||
1207.742 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 59\127 | |||
| | |||
| 883.585<br>603.937 | |||
603.937 | | 134.784<br>92.126 | ||
| 74.88<br>51.181 | |||
92.126 | | 1767.171<br>1207.574 | ||
| | |||
51.181 | |||
1207.574 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 105\226 | |||
| 883.652<br>603.982 | |||
603.982 | | 134.652<br>92.035 | ||
| 75.742<br>51.77 | |||
92.035 | | 1767.303<br>1207.964 | ||
| | |||
51.77 | |||
1207.964 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| 46\99 | |||
| | |||
| | |||
| 883.737<br>604.04 | |||
604.04 | | 134.482<br>91.919 | ||
| 76.847<br>52.525 | |||
91.919 | | 1767.473<br>1208.081 | ||
| {{nowrap|L {{=}} 7|s {{=}} 4}} | |||
52.525 | |||
1208.081 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 125\269 | |||
| 883.808<br>604.089 | |||
604.089 | | 134.339<br>91.822 | ||
| 77.775<br>53.16 | |||
91.822 | | 1767.616<br>1208.178 | ||
| | |||
53.16 | |||
1208.178 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 79\170 | |||
| | |||
| 883.85<br>604.118 | |||
604.118 | | 134.256<br>91.765 | ||
| 78.316<br>53.529 | |||
91.765 | | 1767.699<br>1208.235 | ||
| | |||
53.529 | |||
1208.235 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 112\241 | |||
| 883.896<br>604.149 | |||
604.149 | | 134.163<br>91.701 | ||
| 78.919<br>53.942 | |||
91.701 | | 1767.792<br>1208.299 | ||
| | |||
53.942 | |||
1208.299 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| 33\71 | |||
| | |||
| | |||
| | |||
| 884.007<br>604.225 | |||
604.225 | | 133.94<br>91.549 | ||
| 80.364<br>54.93 | |||
91.549 | | 1768.0145<br>1208.451 | ||
| {{nowrap|L {{=}} 5|s {{=}} 3}} | |||
54.93 | |||
1208.451 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 119\256 | |||
| 884.112<br>604.297 | |||
604.297 | | 133.731<br>91.406 | ||
| 81.725<br>55.859 | |||
91.406 | | 1768.224<br>1208.594 | ||
| | |||
55.859 | |||
1208.594 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 86\185 | |||
| | |||
| 884.152<br>604.324 | |||
604.324 | | 133.651<br>91.351 | ||
| 82.247<br>56.216 | |||
91.351 | | 1768.304<br>1208.649 | ||
| | |||
56.216 | |||
1208.649 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 139\299 | |||
| 884.186<br>604.348 | |||
604.348 | | 133.582<br>91.304 | ||
| 82.694<br>56.522 | |||
91.304 | | 1768.373<br>1208.696 | ||
| Golden Arcturus is near here | |||
56.522 | |||
1208.696 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| 53\114 | |||
| | |||
| | |||
| 884.24<br>604.386 | |||
604.386 | | 133.4705<br>91.228 | ||
| 83.419<br>57.0175 | |||
91.228 | | 1768.4845<br>1208.772 | ||
| | |||
57.0175 | |||
1208.772 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 126\271 | |||
| 884.303<br>604.428 | |||
604.428 | | 133.347<br>91.144 | ||
| 84.219<br>57.565 | |||
91.144 | | 1768.608<br>1208.856 | ||
| | |||
57.565 | |||
1208.856 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 73\157 | |||
| | |||
| 884.3485<br>604.459 | |||
604.459 | | 133.258<br>91.083 | ||
| 84.8005<br>57.962 | |||
91.083 | | 1768.697<br>1208.917 | ||
| style="text-align:center;" | 5/3-Pythagorean is near here | |||
57.962 | |||
1208.917 | |||
| style="text-align:center;" |5/3-Pythagorean is near here | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 93\200 | |||
| 884.409<br>604.5 | |||
604.5 | | 133.137<br>91 | ||
| 85.588<br>58.5 | |||
91 | | 1768.818<br>1209 | ||
| | |||
58.5 | |||
1209 | |||
|- | |- | ||
| | |||
| | |||
| 20\43 | |||
| | |||
| | |||
| | |||
| | |||
| 884.63<br>604.651 | |||
604.651 | | 132.6945<br>90.698 | ||
| 88.463<br>60.465 | |||
90.698 | | 1769.2605<br>1209.302 | ||
| {{nowrap|L {{=}} 3|s {{=}} 2}} | |||
60.465 | |||
1209.302 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 87\187 | |||
| 884.867<br>604.813 | |||
604.813 | | 132.2215<br>90.374 | ||
| 91.538<br>62.567 | |||
90.374 | | 1769.7335<br>1209.626 | ||
| | |||
62.567 | |||
1209.626 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 67\144 | |||
| | |||
| 884.937<br>604.861 | |||
604.861 | | 132.08<br>90.278 | ||
| 92.456<br>63.194 | |||
90.278 | | 1769.875<br>1209.722 | ||
| | |||
63.194 | |||
1209.722 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 114\245 | |||
| 884.991<br>604.898 | |||
604.898 | | 131.972<br>90.204 | ||
| 93.157<br>52.6735 | |||
90.204 | | 1769.983<br>1209.896 | ||
| | |||
52.6735 | |||
1209.896 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| 47\101 | |||
| | |||
| | |||
| 885.068<br>604.9505 | |||
604.9505 | | 131.819<br>90.099 | ||
| 94.156<br>64.356 | |||
90.099 | | 1770.136<br>1209.901 | ||
| {{nowrap|L {{=}} 7|s {{=}} 5}} | |||
64.356 | |||
1209.901 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 121\260 | |||
| 885.141<br>605 | |||
605 | | 131.674<br>90 | ||
| 95.098<br>65 | |||
90 | | 1770.281<br>1210 | ||
| | |||
65 | |||
1210 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 74\159 | |||
| | |||
| 885.187<br>605.031 | |||
605.031 | | 131.582<br>89.937 | ||
| 95.696<br>65.409 | |||
89.937 | | 1770.373<br>1210.063 | ||
| | |||
65.409 | |||
1210.063 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 101\217 | |||
| 885.242<br>605.069 | |||
605.069 | | 131.4715<br>89.862 | ||
| 96.4125<br>65.899 | |||
89.862 | | 1770.4835<br>1210.138 | ||
| | |||
65.899 | |||
1210.138 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| 27\58 | |||
| | |||
| | |||
| | |||
| 885.393<br>605.172 | |||
605.172 | | 131.169<br>89.655 | ||
| 98.377<br>67.241 | |||
89.655 | | 1770.786<br>1210.345 | ||
| {{nowrap|L {{=}} 4|s {{=}} 3}} | |||
67.241 | |||
1210.345 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 88\189 | |||
| 885.566<br>605.291 | |||
605.291 | | 130.822<br>89.418 | ||
| 100.6325<br>68.783 | |||
89.418 | | 1771.133<br>1210.582 | ||
| | |||
68.783 | |||
1210.582 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 61\131 | |||
| | |||
| 885.643<br>605.3435 | |||
605.3435 | | 130.669<br>89.313 | ||
| 101.631<br>69.466 | |||
89.313 | | 1771.286<br>1210.687 | ||
| | |||
69.466 | |||
1210.687 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 95\204 | |||
| 885.714<br>605.392 | |||
605.392 | | 130.526<br>89.216 | ||
| 102.556<br>70.098 | |||
89.216 | | 1771.429<br>1210.784 | ||
| | |||
70.098 | |||
1210.784 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| 34\73 | |||
| | |||
| | |||
| 885.842<br>605.4795 | |||
605.4795 | | 130.271<br>89.041 | ||
| 104.217<br>71.233 | |||
89.041 | | 1771.684<br>1210.959 | ||
| {{nowrap|L {{=}} 5|s {{=}} 4}} | |||
71.233 | |||
1210.959 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 75\161 | |||
| 886.004<br>605.59 | |||
605.59 | | 129.947<br>88.82 | ||
| 106.3205<br>72.671 | |||
88.82 | | 1772.008<br>1211.18 | ||
| | |||
72.671 | |||
1211.18 | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| 41\88 | |||
| | |||
| 886.138<br>605.682 | |||
605.682 | | 129.679<br>88.636 | ||
| 108.065<br>73.864 | |||
88.636 | | 1772.276<br>1211.364 | ||
| {{nowrap|L {{=}} 6|s {{=}} 5}} | |||
73.864 | |||
1211.364 | |||
| | |||
|- | |- | ||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 48\103 | |||
| 886.348<br>605.825 | |||
605.825 | | 129.259<br>88.3495 | ||
| 110.7935<br>75.728 | |||
88.3495 | | 1772.696<br>1211.6505 | ||
| {{nowrap|L {{=}} 7|s {{=}} 6}} | |||
75.728 | |||
1211.6505 | |||
| | |||
|- | |- | ||
| 7\15 | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| | |||
| 887.579<br>606.667 | |||
606.667 | | colspan="2" | 126.797<br>86.667 | ||
| colspan="2 | | 1775.158<br>1213.333 | ||
86.667 | | {{nowrap|L {{=}} 1|s {{=}} 1}} | ||
1213.333 | |||
| | |||
|} | |} | ||
== Scales == | |||
* {{mos scalesig|9L 2s<3/1>|link=1}} (mini chromatic, aka sub-Arcturus) | |||
* {{mos scalesig|11L 2s<3/1>|link=1}} (anti-chromatic, aka anti-Arcturus) | |||
* {{mos scalesig|15L 2s<3/1>|link=1}} (mini enharmonic, aka super-Arcturus 15L 2s) | |||
* {{mos scalesig|17L 2s<3/1>|link=1}} (enharmonic, aka super-Arcturus 17L 2s) | |||
* {{mos scalesig|2L 17s<3/1>|link=1}} (anti-enharmonic, aka trans-Arcturus 2L 7s) | |||
[[Category:Arcturus| ]] <!-- main article --> | |||
[[Category: | [[Category:Rank-2 temperaments]] | ||
[[Category: | [[Category:Non-octave temperaments]] | ||
[[Category: | |||
Latest revision as of 13:52, 28 May 2026
Arcturus is the non-octave rank-2 regular temperament of the 3.5.7 subgroup that tempers out the arcturus comma, 15625/15309. Having an ~5/3 as a generator, this temperament is the application of the Pythagorean principle of tuning a stack of the next higher prime number and then factoring out powers of the equivalence to tritave composition. However, a heptatonic 2L 5s⟨3/1⟩ MOS will not suffice to produce an understandable rendition of it because a very close ~5/3 generates a L:s ratio between 4:1 and 5:1, which is beginning to get too lopsided to still be a complete presentation of a temperament.
For technical data, see No-twos subgroup temperaments #Arcturus.
Etymology
This temperament is named after the star Arcturus, following a series of non-octave temperaments that are named after stars.
Chords
Arcturus contains the triad 5:7:9 (used in Bohlen–Pierce harmony) and the triad 27:35:45 which divides 5/3 into two nearly-equal parts.
Tuning spectrum
Below is a list of MOS families which present it completely (however smearily) using a generator of 845.3 to 951.0 ¢:
| Generator | Cents Hekts |
L | s | 2g | Notes | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 6\13 | 877.825 600 |
146.304 100 |
0 | 1755.651 1200 |
L = 1, s = 0 | ||||||
| 43\93 | 879.399 601.075 |
143.158 97.8495 |
20.451 13.9785 |
1758.797 1202.151 |
L = 7, s = 1 | ||||||
| 37\80 | 879.654 601.25 |
142.647 97.5 |
23.774 16.25 |
1759.38 1202.5 |
L = 6, s = 1 | ||||||
| 68\147 | 879.816 601.3605 |
142.323 97.279 |
25.877 17.687 |
1759.632 1202.721 |
|||||||
| 31\67 | 880.009 601.4925 |
141.937 97.015 |
28.387 19.403 |
1760.081 1202.985 |
L = 5, s = 1 | ||||||
| 87\188 | 880.16 601.596 |
141.634 96.8085 |
30.35 20.745 |
1760.32 1203.191 |
|||||||
| 56\121 | 880.243 601.653 |
141.468 96.694 |
31.437 21.488 |
1760.487 1203.306 |
|||||||
| 81\175 | 880.3335 601.714 |
141.288 96.571 |
32.605 22.286 |
1760.667 1203.429 |
|||||||
| 25\54 | 880.535 601.852 |
140.886 96.296 |
35.221 24.074 |
1761.069 1203.704 |
L = 4, s = 1 | ||||||
| 94\203 | 880.708 601.97 |
140.5385 96.059 |
37.477 25.616 |
1761.4165 1203.971 |
|||||||
| 69\149 | 880.711 602.013 |
140.413 95.973 |
38.294 26.1745 |
1761.542 1204.027 |
|||||||
| 113\244 | 880.823 602.049 |
140.308 95.902 |
38.9745 26.639 |
1761.647 1204.098 |
|||||||
| 44\95 | 880.9055 602.105 |
140.144 95.7895 |
40.041 27.368 |
1761.811 1204.2105 |
L = 7, s = 2 | ||||||
| 107\231 | 880.992 602.1645 |
139.971 95.671 |
41.168 28.1385 |
1761.984 1204.329. |
|||||||
| 63\136 | 881.053 602.206 |
139.85 95.588 |
41.955 28.6765 |
1762.105 1204.412 |
|||||||
| 82\177 | 881.132 602.26 |
139.692 95.48 |
42.982 22.034 |
1762.263 1204.52 |
|||||||
| 19\41 | 881.394 602.439 |
139.167 95.122 |
46.389 31.707 |
1762.788 1204.878 |
L = 3, s = 1 | ||||||
| 89\192 | 881.635 602.604 |
138.684 94.792 |
49.53 33.854 |
1763.271 1205.208 |
|||||||
| 70\151 | 881.701 602.649 |
138.553 94.702 |
50.383 25.828 |
1763.402 1205.298 |
|||||||
| 121\261 | 881.794 602.682 |
138.4565 89.655 |
51.01 34.866 |
1763.4985 1205.362 |
|||||||
| 51\110 | 881.8155 602.727 |
138.324 94.5455 |
51.8715 35.4545 |
1763.631 1205.4545 |
|||||||
| 134\289 | 881.875 602.768 |
138.204 94.464 |
52.649 35.986 |
1763.751 1205.536 |
|||||||
| 83\179 | 881.912 602.793 |
138.131 94.413 |
53.172 36.313 |
1763.824 1205.586 |
|||||||
| 115\248 | 881.955 602.823 |
138.045 94.355 |
53.684 36.6935 |
1763.91 1205.645 |
|||||||
| 32\69 | 882.066 602.899 |
137.823 94.203 |
55.129 37.681 |
1764.132 1205.797 |
L = 5, s = 2 | ||||||
| 109\235 | 882.183 602.979 |
137.588 94.043 |
56.654 38.723 |
1764.367 1205.957 |
|||||||
| 77\166 | 882.232 603.012 |
137.491 93.976 |
57.288 39.157 |
1764.464 1206.024 |
|||||||
| 122\263 | 882.276 603.042 |
137.404 93.916 |
57.854 39.544 |
1764.551 1206.084 |
|||||||
| 45\97 | 882.35 603.093 |
137.2545 93.814 |
58.823 40.206 |
1764.7005 1203.185 |
L = 7, s = 3 | ||||||
| 103\222 | 882.439 603.153 |
137.078 93.694 |
59.972 40.991 |
1764.877 1206.306 |
|||||||
| 58\125 | 882.507 603.2 |
136.941 93.6 |
60.863 41.6 |
1765.014 1206.4 |
|||||||
| 71\153 | 882.607 603.268 |
136.742 93.464 |
62.155 42.484 |
1765.213 1206.536 |
|||||||
| 13\28 | 883.0505 603.571 |
135.854 92.857 |
67.93 46.429 |
1766.101 1207.143 |
L = 2, s = 1 | ||||||
| 72\155 | 883.489 603.871 |
134.9775 92.258 |
73.624 50.323 |
1766.9775 1207.742 |
|||||||
| 59\127 | 883.585 603.937 |
134.784 92.126 |
74.88 51.181 |
1767.171 1207.574 |
|||||||
| 105\226 | 883.652 603.982 |
134.652 92.035 |
75.742 51.77 |
1767.303 1207.964 |
|||||||
| 46\99 | 883.737 604.04 |
134.482 91.919 |
76.847 52.525 |
1767.473 1208.081 |
L = 7, s = 4 | ||||||
| 125\269 | 883.808 604.089 |
134.339 91.822 |
77.775 53.16 |
1767.616 1208.178 |
|||||||
| 79\170 | 883.85 604.118 |
134.256 91.765 |
78.316 53.529 |
1767.699 1208.235 |
|||||||
| 112\241 | 883.896 604.149 |
134.163 91.701 |
78.919 53.942 |
1767.792 1208.299 |
|||||||
| 33\71 | 884.007 604.225 |
133.94 91.549 |
80.364 54.93 |
1768.0145 1208.451 |
L = 5, s = 3 | ||||||
| 119\256 | 884.112 604.297 |
133.731 91.406 |
81.725 55.859 |
1768.224 1208.594 |
|||||||
| 86\185 | 884.152 604.324 |
133.651 91.351 |
82.247 56.216 |
1768.304 1208.649 |
|||||||
| 139\299 | 884.186 604.348 |
133.582 91.304 |
82.694 56.522 |
1768.373 1208.696 |
Golden Arcturus is near here | ||||||
| 53\114 | 884.24 604.386 |
133.4705 91.228 |
83.419 57.0175 |
1768.4845 1208.772 |
|||||||
| 126\271 | 884.303 604.428 |
133.347 91.144 |
84.219 57.565 |
1768.608 1208.856 |
|||||||
| 73\157 | 884.3485 604.459 |
133.258 91.083 |
84.8005 57.962 |
1768.697 1208.917 |
5/3-Pythagorean is near here | ||||||
| 93\200 | 884.409 604.5 |
133.137 91 |
85.588 58.5 |
1768.818 1209 |
|||||||
| 20\43 | 884.63 604.651 |
132.6945 90.698 |
88.463 60.465 |
1769.2605 1209.302 |
L = 3, s = 2 | ||||||
| 87\187 | 884.867 604.813 |
132.2215 90.374 |
91.538 62.567 |
1769.7335 1209.626 |
|||||||
| 67\144 | 884.937 604.861 |
132.08 90.278 |
92.456 63.194 |
1769.875 1209.722 |
|||||||
| 114\245 | 884.991 604.898 |
131.972 90.204 |
93.157 52.6735 |
1769.983 1209.896 |
|||||||
| 47\101 | 885.068 604.9505 |
131.819 90.099 |
94.156 64.356 |
1770.136 1209.901 |
L = 7, s = 5 | ||||||
| 121\260 | 885.141 605 |
131.674 90 |
95.098 65 |
1770.281 1210 |
|||||||
| 74\159 | 885.187 605.031 |
131.582 89.937 |
95.696 65.409 |
1770.373 1210.063 |
|||||||
| 101\217 | 885.242 605.069 |
131.4715 89.862 |
96.4125 65.899 |
1770.4835 1210.138 |
|||||||
| 27\58 | 885.393 605.172 |
131.169 89.655 |
98.377 67.241 |
1770.786 1210.345 |
L = 4, s = 3 | ||||||
| 88\189 | 885.566 605.291 |
130.822 89.418 |
100.6325 68.783 |
1771.133 1210.582 |
|||||||
| 61\131 | 885.643 605.3435 |
130.669 89.313 |
101.631 69.466 |
1771.286 1210.687 |
|||||||
| 95\204 | 885.714 605.392 |
130.526 89.216 |
102.556 70.098 |
1771.429 1210.784 |
|||||||
| 34\73 | 885.842 605.4795 |
130.271 89.041 |
104.217 71.233 |
1771.684 1210.959 |
L = 5, s = 4 | ||||||
| 75\161 | 886.004 605.59 |
129.947 88.82 |
106.3205 72.671 |
1772.008 1211.18 |
|||||||
| 41\88 | 886.138 605.682 |
129.679 88.636 |
108.065 73.864 |
1772.276 1211.364 |
L = 6, s = 5 | ||||||
| 48\103 | 886.348 605.825 |
129.259 88.3495 |
110.7935 75.728 |
1772.696 1211.6505 |
L = 7, s = 6 | ||||||
| 7\15 | 887.579 606.667 |
126.797 86.667 |
1775.158 1213.333 |
L = 1, s = 1 | |||||||
Scales
- 9L 2s⟨3/1⟩ (mini chromatic, aka sub-Arcturus)
- 11L 2s⟨3/1⟩ (anti-chromatic, aka anti-Arcturus)
- 15L 2s⟨3/1⟩ (mini enharmonic, aka super-Arcturus 15L 2s)
- 17L 2s⟨3/1⟩ (enharmonic, aka super-Arcturus 17L 2s)
- 2L 17s⟨3/1⟩ (anti-enharmonic, aka trans-Arcturus 2L 7s)