Three Sisters (agriculture)

The Three Sisters are the three main agricultural crops of various Native American groups in North America: winter squash, maize (corn), and climbing beans (typically tepary beans or common beans). One of the major Native American tribes that used these "Three Sisters" to trade with others was the Iroquois Confederacy.

In one technique known as companion planting, the three crops are planted close together. Flat-topped mounds of soil are built for each cluster of crops. Each mound is about 30 cm (12 in) high and 50 cm (20 in) wide, and several maize seeds are planted close together in the center of each mound. In parts of the Atlantic Northeast, rotten fish or eels are buried in the mound with the maize seeds, to act as additional fertilizer where the soil is poor. When the maize is 15 cm (6 inches) tall, beans and squash are planted around the maize, alternating between the two kinds of seeds. The process to develop this agricultural knowledge took place over 5,000–6,500 years. Squash was domesticated first, with maize second and then beans being domesticated. Squash was first domesticated 8,000–10,000 years ago.

Three Sisters (Riverside County)

The Three Sisters is a small mountain range, or a mountain with three summits, within the northeastern Temescal Mountains, in Riverside County, California.

The Three Sisters, is located east and north of Mockingbird Canyon, and south of Woodcrest.

References

Three Sisters (Georgia)

Three Sisters Mountain is a mountain near Dahlonega, Lumpkin County, Georgia with a trio of peaks known locally as Rattlesnake, Wildcat and McBrayer. The middle summit is the highest with an elevation of 2,131 feet (650 m).

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Edo (given name)

Edo is a male given name. It may refer to:

Arts

Sports

31 equal temperament

In music, 31 equal temperament, 31-ET, which can also be abbreviated 31-TET, 31-EDO (equal division of the octave), also known as tricesimoprimal, is the tempered scale derived by dividing the octave into 31 equal-sized steps (equal frequency ratios).  Play  Each step represents a frequency ratio of 2^1/31, or 38.71 cents ( Play ).

31-ET is a very good approximation of quarter-comma meantone temperament. More generally, it is a tuning of the syntonic temperament in which the tempered perfect fifth is equal to 696.77 cents, as shown in Figure 1. On an isomorphic keyboard, the fingering of music composed in 31-ET is precisely the same as it is in any other syntonic tuning (such as 12-ET), so long as the notes are spelled properly -- that is, with no assumption of enharmonicity.

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19 equal temperament

In music, 19 equal temperament, called 19-TET, 19-EDO ("Equal Division of the Octave"), or 19-ET, is the tempered scale derived by dividing the octave into 19 equal steps (equal frequency ratios). Each step represents a frequency ratio of 2^1/19, or 63.16 cents ( Play ). Because 19 is a prime number, one can use any interval from this tuning system to cycle through all possible notes; just as one may cycle through 12-edo on the circle of fifths, the number 7 (of semitones in a fifth in 12-edo) being coprime to 12.

19-edo is the tuning of the syntonic temperament in which the tempered perfect fifth is equal to 694.737 cents, as shown in Figure 1 (look for the label "19-TET"). On an isomorphic keyboard, the fingering of music composed in 19-edo is precisely the same as it is in any other syntonic tuning (such as 12-edo), so long as the notes are spelled properly—that is, with no assumption of enharmonicity.

History