umbra recta

suomi-englanti sanakirja

umbra recta englanniksi

On a shadow in the shape of a triangle, the length of the shadow's edge adjacent to a measured angle.
{{quote-book|en|year=1688|author=John Hales|chapter=The Rich man’s ''Recepiſti''|title=Golden Remains|edition=3rd|pageurl=http://books.google.co.uk/books?id=ZEk3AAAAMAAJ&pg=PA77&dq=%22umbra+recta%22&hl=en&sa=X&ei=FldlT__PEMLu8AO5zMDGDg&ved=0CEoQ6AEwAAv=onepage&q=%22umbra%20recta%22&f=false|page=77