; Ãß°¡ÀûÀÎ ½Ã°£ ¼­¹ö¸¦ ÀÌ ÆÄÀÏ¿¡ Ãß°¡ÇÒ ¼ö ÀÖ½À´Ï´Ù ; ;±×·¯³ª ´ÙÀ½°ú °°Àº Çü½ÄÀ» »ç¿ëÇÏ¿© Á¤º¸¸¦ Ãß°¡ÇØ¾ß ÇÕ´Ï´Ù : Description (server_name) ; National Institute of Standards and Technology (time.nist.gov) U.S. Naval Observatory (tock.usno.navy.mil) Caltech University (montpelier.caltech.edu)