... ATNF Home . About ATNF . ... About ATNF overview . ... Australia Telescope Steering Committee . ... Parkes radio telescope . Australia Telescope Compact Array . ... CASS research and development programs offer excellent opportunities for training at graduate, undergraduate, diploma and trade levels.б As well as PhD and Masters level possibilities, CASS operates a highly competitive industrial experience program for undergraduates.б See the information on the ATNF summer vacation Program. ...
metrologia The leap second: its history and possible future R. A. Nelson, D. D. McCarthy , S. Malys, J. Levine, B. Guinot, H. F. Fliegel , R. L. Beard and T. R. Bartholome w Abstract. This paper reviews the theoretica l motivatio n for the leap second in the context of the historica l evolutio n of time measurement . Th e periodic insertio n of a leap second step into th e scale of Coordinate d Universal Time (UTC) necessitates frequent changes in comple x timekeepin g systems an d is currentl y th e