Main Page | See live article | Alphabetical index Centuries: 7th century - 8th century - 9th century Decades: 670s 680s 690s 700s 710s - 720s - 730s 740s 750s 760s 770s Years: 718 719 720 721 722 - 723 - 724 725 726 727 728 Events The world's first mechanical clock is allegedly built in China. See celestial globe. Births Deaths\n This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.