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Definitions (236)
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å
Angstrom (0.0001 micrometer, 0.1 nm).
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nrz
Non-return to zero. Modulation scheme in which a phase deviation is held for a period of time in order to represent a data symbol. See Chapter 10.
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walking orbit
A spacecraft orbit that precesses, wherein the location of periapsis changes with respect to the planet's surface in a useful way. See sun-synchronous.
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aaas
American Association for the Advancement of Science.
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aas
American Astronomical Society.
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acceleration
Change in velocity. Note that since velocity comprises both direction and magnitude (speed), a change in either direction or speed constitutes acceleration.
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alt
Altimetry data.
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am
Attometer (10-18 m).
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amor
A class of Earth-crossing asteroid.
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