- Industry: Aerospace
- Number of terms: 16933
- Number of blossaries: 2
- Company Profile:
The Executive Branch agency of the United States government, responsible for the nation's civilian space program and aeronautics and aerospace research.
A multiplier, x1018 from the Greek "hex" (six, the "h" is dropped). The reference to six is because this is the sixth multiplier in the series k, M, G, T, P, E. See the entry for CGPM.
Industry:Aerospace
A unit of force equal to the force required to accelerate a 1-g mass 1 cm per second per second. Compare with Newton.
Industry:Aerospace
Replaces Ephemeris Time, ET, as the independent argument in dynamical theories and ephemerides. Its unit of duration is based on the orbital motions of the Earth, Moon, and planets. DT has two expressions, Terrestrial Time, TT, (or Terrestrial Dynamical Time, TDT), and Barycentric Dynamical Time, TDB. More information on these, and still more timekeeping expressions, may be found at the U.S. Naval Observatory website.
Industry:Aerospace
NASA's worldwide spacecraft tracking facility managed and operated by JPL.
Industry:Aerospace
The system of computers, software, networks, and procedures that processes data from the DSN at JPL.
Industry:Aerospace
One of three DSN tracking sites at Goldstone, California; Madrid, Spain; and Canberra, Australia; spaced about equally around the Earth for continuous tracking of deep-space vehicles.
Industry:Aerospace
The effect on frequency imposed by relative motion between transmitter and receiver. See Chapter 6.
Industry:Aerospace
The point at which an orbit crosses a reference plane (such as a planet's equatorial plane or the ecliptic plane) going south.
Industry:Aerospace
