When specifying spatial coordinates, the following prefixes can be used: * for RA or DEC in resp. ... HMS and DMS in EPOCH xxxx.x G Galactic longitude or latitude in degrees E Ecliptic longitude or latitude in degrees S Supergalactic longitude or latitude in degrees . ... Input of RA 3 h 14 m 38.02 s, DEC 41 d 13 m 54.84 s in epoch 2000.0 . ... Input of a box centered at 56.7 degrees galactic longitude and 9.89 degrees latitude with size 12x10 seconds of arc. ...

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