Using Quasars to Measure the Earth: A Brief History of VLBI
Looking Down a Well: A Brief History of Geodesy
NASA and US Air Force reach agreement09/06/2013
An agreement was reached between NASA and the US Air Force concerning the hosting of NASA supplied laser retroreflector arrays onto future GPS satellites. This agreement gives NASA the formal approval to move forward with the GPS Laser Retroreflector Array (GPS-LRA) Project that will supply the retroreflectors for the GPS-III satellites starting with SV-9.
Earth Orientation Animations 03/01/2013 When you think of the Earth’s orientation, you’d probably imagine something like a globe, where it always rotates around an axis, called the spin axis, defined by the north and south poles. And while this generally makes sense, in reality, the Earth’s orientation is constantly changing very slightly, and this change can be described in three ways. Learn more about how the Earth's orientation changes by watching these animations.
Staff Profile: Stephen Merkowitz, Project Manager Project manager Stephen Merkowitz talks about his work with NASA's Space Geodesy Project, including a brief overview of the four fundamental techniques of space geodesy: GPS, VLBI, SLR, and DORIS.
Staff Profile: Jan McGarry, Mathematician Mathematician Jan McGarry discusses the science and history of Satellite Laser Ranging (SLR), her role in developing the Next Generation Satellite Laser Ranging system, and her career at NASA's Goddard Space Flight Center.
Staff Profile: Chopo Ma, Space Geodesist
Space geodesist Chopo Ma explains the science of Very Long Baseline Interferometry (VLBI): using radio emissions from distant galaxies to create a precise reference frame for the Earth.
Staff Profile: Carey Noll, Computer Scientist
Computer scientist Carey Noll talks about her job as manager of the Crustal Dynamics Data Information System (CDDIS), the applications of her work for various space geodesy techniques such as GPS, and her career at NASA's Goddard Space Flight Center.