Earth Lights at Night

NASA’s three Deep Space Network stations are separated by about 120 degrees of longitude so they can continuously track a spacecraft as the Earth rotates.

Caption:
The 3 Deep Space Network stations are separated by about 120 degrees of longitude so they can track spacecraft continuously as Earth rotates.
Type: Photograph
Image Date: 2012
Credit: Data courtesy Marc Imhoff of NASA GSFC and Christopher Elvidge of NOAA NGDC. Image by Craig Mayhew and Robert Simmon, NASA GSFC.
Origin: Jet Propulsion Laboratory, National Oceangraphic and Atmospheric Administration
Navigation Methods
 
The 3 Deep Space Network stations are separated by about 120 degrees of longitude so they can track spacecraft continuously as Earth rotates.