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What (who) is YBC 7289 - definition
YBC 7289
![Babylonian clay tablet YBC 7289 with annotations. The diagonal displays an approximation of the [[square root of 2]] in four [[sexagesimal]] figures, 1 24 51 10, which is good to about six [[decimal]] digits.<br />1 + 24/60 + 51/60<sup>2</sup> + 10/60<sup>3</sup> = 1.41421296... The tablet also gives an example where one side of the square is 30, and the resulting diagonal is 42 25 35 or 42.4263888...](https://commons.wikimedia.org/wiki/Special:FilePath/YBC-7289-OBV-labeled.jpg?width=200 "Babylonian clay tablet YBC 7289 with annotations. The diagonal displays an approximation of the [[square root of 2]] in four [[sexagesimal]] figures, 1 24 51 10, which is good to about six [[decimal]] digits.<br />1 + 24/60 + 51/60<sup>2</sup> + 10/60<sup>3</sup> = 1.41421296... The tablet also gives an example where one side of the square is 30, and the resulting diagonal is 42 25 35 or 42.4263888...")
ANCIENT CLAY TABLET SHOWING AN APPROXIMATION OF √2
YBC 7289 is a Babylonian clay tablet notable for containing an accurate sexagesimal approximation to the square root of 2, the length of the diagonal of a unit square. This number is given to the equivalent of six decimal digits, "the greatest known computational accuracy ...
