Space flight

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

International celestial reference system (ICRS)

Aerospace; Space flight

Conceptual basis for celestial positions, aligned with respect to extremely distant objects and utilising the theory of general relativity. Link.

International celestial reference frame (ICRF)

Aerospace; Space flight

The realisation 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 time of day.

Galilean satellites

Aerospace; Space flight

The four large satellites of Jupiter so named because Galileo discovered them when he turned his telescope toward Jupiter: Io, Europa, Ganymede, and Callisto.

Gal

Aerospace; Space flight

Unit of gravity field measurement corresponding to a gravitational acceleration of 1 cm/sec2.

Gramme (g)

Aerospace; Space flight

A thousandth of the metric standard unit of mass (see kg). The gramme was originally based upon the weight of a cubic centimetre of water, which still approximates the current value.

Acceleration due to a body's gravity (g)

Constant at any given place, the value of g varies from object to object (e.g. Planets), and also with the distance from the centre of the object. The relationship between the two constants is: g = ...