5 Terms
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Space flight
Of or relating to the act of voyaging outside the Earth's atmosphere and into outer space, and the science involved in achieving it.
Industry: Aerospace
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Space flight
One-way
Aerospace; Space flight
Communications mode consisting only of downlink received from a spacecraft.
Non-return to zero (NRZ)
Aerospace; Space flight
Modulation scheme in which a phase deviation is held for a period of time in order to represent a data symbol. See Chapter 10.
Nutation
Aerospace; Space flight
A small nodding motion in a rotating body. Earth's nutation has a period of 18.6 years and an amplitude of 9.2 arc seconds.
Non-coherent
Aerospace; Space flight
Communications mode wherein a spacecraft generates its downlink frequency independent of any uplink frequency.
Nautical twilight
Aerospace; Space flight
For technical definition, please follow this link to the U.S. Naval Observatory Astronomical Applications website.
Nadir
Aerospace; Space flight
The direction from a spacecraft directly down toward the centre of a planet. Opposite the zenith.
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