圭 guī jade pointed at top Definitions Defs Origin Strokes Stroke Words Sentences Sents Showing: sundial All meanings 3 guī 3 jade tablet 1sundial 1tiny amount 1 1 sentence for 圭 (guī — sundial) 古人通过圭表投下的影子来确定冬至和夏至。 gǔrén tōngguò guī biǎo tóuxià de yǐngzi lái quèdìng Dōngzhì hé Xiàzhì. The ancients determined the winter and summer solstices by observing the shadows cast by the gnomon. Source: Dong Chinese Dictionary