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Aerospace
Industry that includes methods of travel and spacecraft for navigating the air or space.
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Aerospace > Space flight 
intermediate frequency (IF)
Aerospace; Space flight
In a radio system, a selected processing frequency between RF (Radio Frequency) and the end product (e.g. Audio frequency).
international celestial reference system (ICRS)
Aerospace; Space flight
Conceptual basis for celestial positions, aligned with respect to extremely distant objects and utilizing the theory of general relativity. Link.
international celestial reference frame (ICRF)
Aerospace; Space flight
The realization of the ICRS provided by the adopted positions of extragalactic objects.
hour angle
Aerospace; Space flight
The angular distance of a celestial object measured westward along the celestial equator from the zenith crossing. In effect, HA represents the RA for a particular location and ...
horizon
Aerospace; Space flight
The line marking the apparent junction of Earth and sky. For the technical definition, please follow this link to the U.S. Naval Observatory's Astronomical Applications.
hohmann transfer orbit
Aerospace; Space flight
Interplanetary trajectory using the least amount of propulsive energy. See Chapter 4.
high-gain antenna (hga)
Aerospace; Space flight
An antenna onboard of a spacecraft with a focused, narrow radiowave beam width. This narrow beam width allows more precise targeting of the radio signal - also known as a ...
Sub-categories
- Control systems (1744)
- Satellites (11359)
- Space flight (8863)
- Space shuttle (354)