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Knight's Mechanical Encyclopedia (ed. Knight), G. (search)
.89 feet. The gnomon of the sun-dial of Delhi takes the form of an elevated staircase. See dial. The gnomon or style of a horizontal dial has an edge parallel to the axis of the earth, and makes with the horizontal plane of the dial-plate an angle equal to the latitude of the place. The gnomon was anciently used in China for astronomical purposes, but this people did not excel in dialing. A measurement of the length of the solstitial shadow, made by Tschea-Kung, at Loyang, on the Yellow River, 1200 B. C., was found by Laplace (quoted by Humboldt in Cosmos, Val. 11. p. 1151 to accord perfectly with the present accepted theory of the change in the obliquity of the ecliptic. The sun-dial and the gnomon, with the division of the day into twelve parts, were received by the Greeks from the Babylonians. Herodotus, 2. 109. Eubulus, the comie poet, quoted by Athenaeus, who wrote about A. D. 220, says: — We have invited two unequalled men, Philo-crates and eke Philocrates, —