What others said about Arabic Read in the original
In his book, in a chapter on finding latitude:
“Arabs first developed tables of tangents, appropriately called shadow tables, in roughly AD 860.”
John Edward Huth
b. 1958
American physicist at Harvard University, author of a book on traditional navigation and wayfinding.
In Arabic
كان العربُ أوّلَ مَن وضع جداولَ الظِّلّ، وهو اسمٌ يليق بها، نحو سنة ٨٦٠م.
Source
The Lost Art of Finding Our Way, Cambridge, MA: Harvard University Press, 2013
He wrote in English; the Arabic is ours. The printed Arabic has «tables of declination», which mistranslates tables of tangents.
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