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http://www.atnf.csiro.au/ATNF-DailyImage/archive/2015/28-Apr-2015.html.
http://www.atnf.csiro.au/ATNF-DailyImage/archive/2015/28-Apr-2015.html.
1. ATNF Daily Astronomy Picture
... Hydrogen streams in the Grus Quartet . ... The Grus Quartet consists of four large spiral galaxies, three of which appear to be close together (NGC 7582, NGC 7590 and NGC 7599), while the nearly face-on starburst galaxy NGC 7552 is located a bit further to the west. A dwarf irregular galaxy lies just north of the starburst galaxy NGC 7582, which features prominent HI tidal tails and debris. ... today * ATNF | Parkes | ATCA | ...
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Ссылки http://www.atnf.csiro.au/ATNF-DailyImage/archive/2015/20-Apr-2015.html -- 3.7 Кб -- 10.04.2016
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2. http://www.atnf.csiro.au/iau-comm31/pdf/Leap%20Second.pdf
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
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Ссылки http://www.atnf.csiro.au/iau-comm31/pdf/Leap%20Second.pdf -- 382.0 Кб -- 26.09.2010
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