... ATNF Home . ... About ATNF overview . ... Parkes radio telescope . ... Parkes | ... PULSE@Parkes . ... A PULSE@Parkes remote observing session requires that the students be brought to ATNF Headquarters at Marsfield, Sydney. ... A key part of any observing session is the interaction via videoconferencing between the students controlling the telescope and the astronomers in the control tower at Parkes. ... Students from Muswellbrook High School observing, assisted by ATNF astronomer Dr David Champion....
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