1 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
Earth-received time (ERT)
Aerospace; Space flight
UTC of an event at DSN receive-time, equal to SCET plus OWLT.
Equinox
Aerospace; Space flight
The equinoxes are times at which the centre of the Sun is directly above the Earth's equator. The day and night would be of equal length at that time, if the Sun were a point and not a disc, and if ...
Equator
Aerospace; Space flight
An imaginary circle around a body which is everywhere equidistant from the poles, defining the boundary between the northern and southern hemispheres.
Descending node
Aerospace; Space flight
The point at which an orbit crosses a reference plane (such as a planet's equatorial plane or the ecliptic plane) going south.
Density
Aerospace; Space flight
Mass per unit volume. For example, the density of water can be stated as 1 gram/cm3.
Declination
Aerospace; Space flight
The measure of a celestial body's apparent height above or below the celestial equator.
Decibel
Aerospace; Space flight
Db, an expression of ratio (see db, above). One tenth of a Bel. See NIST website for further definition.
