Color-coordinate system from a 13th-century account of rainbows.

A three-dimensional color space from the 13th century.

We present a new commentary on Robert Grosseteste's De colore, a short treatise that dates from the early 13th century, in which Grosseteste constructs a linguistic combinatorial account of color. In contrast to other commentaries (e.g., Kuehni & Schwarz, Color Ordered: A Survey of Color Order Systems from Antiquity to the Present, 2007, p. 36), we argue that the color space described by Grosse...

Vibration Mechanism of 13th Century Historical Menar-Jonban Monument in Iran

Abstract    Historical monument of Menar-Jonban (shaking tower) is located in the famous city of Isfahan in central Iran. Initial construction of this interesting and unique masonry monument belongs to 700 years ago. This monument has two vibrating circular towers of 7.5 m height. These towers are separated from each other by a distance of 9.2 m and constructed on top of an ancient tomb of 10 m...

Introducing Books/Rhyming and Rational: A Comparative Reading of Two 13th-Century Persian Treatises on Poetry, Shaghayegh Aruji

Rainbows and fogbows.

The optics of rainbows and fogbows is investigated theoretically for monodisperse drops using Mie theory. Included in the calculations are a realistic solar illumination spectrum and the finite size of the sun. Drop sizes range from 3 to 300 microm (3800 > X > 38). Results are presented on the location, width, contrast, polarization, and color of both primary and secondary rainbows. Particular ...

A Comparative Study of Design, Pattern and Color in Kelardasht Carpet with Senneh Carpet

Hodud al-Ālam (Boundaries of the World), a geography book from the 3rd century AH/ AD 9th century is the first source that refers to the act of weaving carpets in Tabarestan, northern Iran. This book regards the Tabari carpet as a product of that region to the court of the Abbasid caliphs; however the oldest carpet of Tabarestan known is the Kelardasht carpet. There are four theories about the ...