In or near Iioo B.C., Chou Kung, an able mathematician, determined with surprising accuracy the obliquity of the ecliptic; but his attempts to estimate the sun's distance failed hopelessly as being grounded on belief in the flatness of the earth.
Flatness and lack of deep shadows, owing to the impossibility of obtaining heavy cornices in that material, mark the style.
A main building with wings; the large amount of window space; the comparative flatness of the façades; the employment of a cornice to each storey; the effect of light and shade given by the balconies; and in churches by the circular pediments on the facades.
The qualities, too have to be considered - the fulness of one, the flatness of the other, or the coarseness or fineness of the furs.
The flatness of faces of stone or rock (both granite and limestone) was tested by placing a true-plane trial plate, smeared with red ochre, against the dressed surface, as in modern engineer.