By Christina B Castro 1æ¥ã¯24æéã§è¡¨ããã¨ãã§ãã1æéã¯60åã1åã¯60ç§ã§è¡¨ããã¨ãã§ãã¾ããæ¥ã ã®çæ´»ã«å®å ¨ã«æº¶ãè¾¼ãã§ãããããã®æ°åã®èµ·æºã¯ä¸ä½ã©ãããæ¥ããã®ãªã®ã§ããããï¼Scientific Americanãè¨æ¸¬å¦è ãã¢ã¡ãªã«å½ç«æ¨æºæè¡ç 究æãªã©ããè«æ ãã¨ããªããããããã®èµ·æºã«ã¤ãã¦ã¾ã¨ãã¦ãã¾ãã Why is a minute divided into 60 seconds, an hour into 60 minutes, yet there are only 24 hours in a day?: Scientific American http://www.scientificamerican.com/article.cfm?id=experts-time-division-days-hours-minutes ç¾å¨ä¸çã§æã使
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