Content on this page requires a newer version of Adobe Flash Player.

Get Adobe Flash player

Using Quasars to Measure the Earth: A Brief History of VLBI

Looking Down a Well: A Brief History of Geodesy



  • Goddard logo Robert H. Goddard Award Recipients 03/18/2014 Congratulations to the Space Geodesy Project Team for receiving the Robert H. Goddard Exceptional Achievement Group Award for Engineering. Additional congratulations goes to Jan McGarry, who received an individual Robert H. Goddard Award for Exceptional Engineering Achievement.
  • Link to full article NASA and US Air Force reach agreement 09/06/2013 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.

    Read more
  • 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.

    Read more
  • "Sizing Up Earth" for iPad
    Read an introduction to Space Geodesy using the NASA Visualization iPad app.

    Read more
    Download NASA Visualization iPad app
  • 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.

    Watch video
  • 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.

    Watch video
  • 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.

    Watch video
  • 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.

    Watch video