Showing posts with label geometry. Show all posts
Showing posts with label geometry. Show all posts

Friday, February 05, 2016

Babylonians used geometrical methods, 350-50 BCE

"Ancient Babylonian astronomers calculated Jupiter’s position from the area under a time-velocity graph" / Mathieu Ossendrijver

Science  29 Jan 2016:
Vol. 351, Issue 6272, pp. 482-484
DOI: 10.1126/science.aad8085


The idea of computing a body’s 
displacement as an area in time-velocity space is usually traced back to 14th-century Europe. I show that in four ancient Babylonian cuneiform tablets, Jupiter’s displacement along the ecliptic is computed as the area of a trapezoidal figure obtained by drawing its daily displacement against time. This interpretation is prompted by a newly discovered tablet on which the same computation is presented in an equivalent arithmetical formulation. The tablets date from 350 to 50 BCE. The trapezoid procedures offer the first evidence for the use of geometrical methods in Babylonian mathematical astronomy, which was thus far viewed as operating exclusively with arithmetical concepts.

BBC Report

Sophisticated geometry - the branch of mathematics that deals with shapes - was being used at least 1,400 years earlier than previously thought, a study suggests.
Research shows that the Ancient Babylonians were using geometrical calculations to track Jupiter across the night sky.
Previously, the origins of this technique had been traced to the 14th Century.
The new study is published in Science.
Its author, Prof Mathieu Ossendrijver, from the Humboldt University of Berlin, Germany, said: "I wasn't expecting this. It is completely fundamental to physics, and all branches of science use this method."

For the rest of the BBC report, see: