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NGSLR NASA Explains Why June 30 Will Get Extra SecondRelease Date: 06/26/2015 The day will officially be a bit longer than usual on Tuesday, June 30, 2015, because an extra second, or "leap" second, will be added.

"Earth's rotation is gradually slowing down a bit, so leap seconds are a way to account for that," said Daniel MacMillan of NASA’s Goddard Space Flight Center in Greenbelt, Maryland.

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NGSLR 19th International Laser Ranging Workshop a great successRelease Date: 11/18/2014The 19th International Laser Ranging Workshop was hosted by NASA GSFC from October 27-31, 2014 in Annapolis, Maryland. October 31 marks the 50th anniversary of the first successful Satellite Laser Ranging (SLR) measurement which occurred at the Goddard Geophysical and Astronomical Observatory (GGAO) in 1964. The theme for this workshop, "Celebrating 50 Years of SLR: Remembering the Past and Planning for the Future" allowed the community to look back on its many accomplishments and to present plans for future advances in SLR technology and science.

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NGSLR Celebrating 50 Years of Satellite Laser Ranging at NASA Goddard Space Flight CenterRelease Date: 08/28/2014In a field near Goddard 50 years ago this October, the first successful Satellite Laser Ranging (SLR) measurements were taken, ushering in a new era in the science of measuring the Earth.

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workshop logo ITRF2013Release Date: 08/25/2014The ILRS Analysis Working Group (AWG) is finishing its contribution to the development of the next realization of the International Terrestrial Reference Frame (ITRF2013). Preliminary solution has been delivered to the IERS -- and final solution will be delivered by September.

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