Mathematical mystery solved: A famous 3700-year old Babylonian clay tablet, known as Plimpton 322, is the world’s oldest and most accurate trigonometric table, possibly used by ancient mathematical scribes to calculate how to construct palaces and temples and build canals.
This is the conclusion of UNSW Sydney scientists, who have discovered the purpose of the small tablet which was found in the early 1900s in what is now southern Iraq. The findings published in the Historia Mathematica, the official journal for the International Commission on the History of Math, reveal how researchers dated the ancient clay tablet and came to conclusions about its use.
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According to the new research the Babylonians, not the Greeks, were the first to study trigonometry – the study of triangles – and reveals an ancient mathematical sophistication that had been hidden until now.
The small tablet was discovered about 100 years ago by archaeologist, academic, diplomat and antiquities dealer Edgar Banks, the person on whom the fictional character Indiana Jones was based. It was later bought by George Arthur Plimpton in 1922 and has been called the Plimpton 322 tablet ever since.
The Tablet has four columns and 15 rows of numbers written on it in the cuneiform script of the time using a base 60, or sexagesimal, system.
“The huge mystery, until now, was its purpose – why the ancient scribes carried out the complex task of generating and sorting the numbers on the tablet,” explains Dr Mansfield and UNSW Associate Professor Norman Wildberger
“Our research reveals that Plimpton 322 describes the shapes of right-angled triangles using a novel kind of trigonometry based on ratios, not angles and circles. It is a fascinating mathematical work that demonstrates undoubted genius.
The new study reached the conclusions that the tablet was used for the study of triangles by findings based on ratios, not angles. Wildberger says that in the top row relatively equal ratios create a nearly equilateral triangle. Descending down the tablet, the ratios decrease the triangle’s inclination, creating narrower triangles.
A trigonometric table allows you to use one known ratio of the sides of a right-angle triangle to determine the other two unknown ratios.
The Greek astronomer Hipparchus, who lived about 120 years BC, has long been regarded as the father of trigonometry, with his “table of chords” on a circle considered the oldest trigonometric table.
“Plimpton 322 predates Hipparchus by more than 1000 years,” says Dr Wildberger. “It opens up new possibilities not just for modern mathematics research, but also for mathematics education. With Plimpton 322 we see a simpler, more accurate trigonometry that has clear advantages over our own.”
“A treasure-trove of Babylonian tablets exists, but only a fraction of them have been studied yet. The mathematical world is only waking up to the fact that this ancient but very sophisticated mathematical culture has much to teach us.”
Dr Mansfield read about Plimpton 322 by chance when preparing material for first year mathematics students at UNSW. He and Dr Wildberger decided to study Babylonian mathematics and examine the different historical interpretations of the tablet’s meaning after realizing that it had parallels with the rational trigonometry of Dr Wildberger’s book Divine Proportions: Rational Trigonometry to Universal Geometry.
The 15 rows on the tablet describe a sequence of 15 right-angle triangles, which are steadily decreasing in inclination.
The left-hand edge of the tablet is broken and the UNSW researchers build on previous research to present new mathematical evidence that there were originally 6 columns and that the tablet was meant to be completed with 38 rows.
They also demonstrate how the ancient scribes, who used a base 60 numerical arithmetic similar to our time clock, rather than the base 10 number system we use, could have generated the numbers on the tablet using their mathematical techniques.
The UNSW Science mathematicians also provide evidence that discounts the widely-accepted view that the tablet was simply a teacher’s aid for checking students’ solutions of quadratic problems.
“Plimpton 322 was a powerful tool that could have been used for surveying fields or making architectural calculations to build palaces, temples or step pyramids,” says Dr Mansfield.
The tablet, which is thought to have come from the ancient Sumerian city of Larsa, has been dated to between 1822 and 1762 BC. It is now in the Rare Book and Manuscript Library at Columbia University in New York.
A Pythagorean triple consists of three, positive whole numbers a, b and c such that a2 + b2 = c2. The integers 3, 4 and 5 are a well-known example of a Pythagorean triple, but the values on Plimpton 322 are often considerably larger with, for example, the first row referencing the triple 119, 120 and 169.
The name is derived from Pythagoras’ theorem of right-angle triangles which states that the square of the hypotenuse (the diagonal side opposite the right angle) is the sum of the squares of the other two sides.