Old Babylonian Systems of Weights and Measures

1897 ◽  
Vol 18 ◽  
pp. 366
Author(s):  
George A. Reisner
Keyword(s):  
Weights And Measures ◽  
Old Babylonian

Weights and Measures

1866 ◽  
Vol 14 (24) ◽  
pp. 393-393
Keyword(s):  
Weights And Measures

Dimensions of plane and solid angles and their units in the International System of Units (SI)

2020 ◽  
pp. 26-32
Author(s):  
M. I. Kalinin ◽  
L. K. Isaev ◽  
F. V. Bulygin
Keyword(s):  
Solid Angle ◽  
International System ◽  
International Committee ◽  
Plane Angle ◽  
Arc Length ◽  
Weights And Measures ◽  
International System Of Units ◽  
System Of Units ◽  
In Series ◽  
Solid Angles

The situation that has developed in the International System of Units (SI) as a result of adopting the recommendation of the International Committee of Weights and Measures (CIPM) in 1980, which proposed to consider plane and solid angles as dimensionless derived quantities, is analyzed. It is shown that the basis for such a solution was a misunderstanding of the mathematical formula relating the arc length of a circle with its radius and corresponding central angle, as well as of the expansions of trigonometric functions in series. From the analysis presented in the article, it follows that a plane angle does not depend on any of the SI quantities and should be assigned to the base quantities, and its unit, the radian, should be added to the base SI units. A solid angle, in this case, turns out to be a derived quantity of a plane angle. Its unit, the steradian, is a coherent derived unit equal to the square radian.

A recut Old Babylonian seal from Area I of Tell Kazel

Syria ◽  
1994 ◽  
Vol 71 (3) ◽  
pp. 347-348
Author(s):  
D. Collon
Keyword(s):  
Old Babylonian
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