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The Spitzer Space Telescope’s infrared cameras revealing stars in the densely populated galactic center region. The Catalogue of Fundamental Stars is a series of six astrometric catalogues of high precision positional data for a small selection of stars to define a celestial reference frame, which is a standard coordinate system for measuring positions of stars.
A reference frame has been defined as "a catalogue of the adopted coordinates of a set of reference objects that serves to define, or realize, a particular coordinate frame". [7] A reference system is a broader concept, encompassing "the totality of procedures, models and constants that are required for the use of one or more reference frames".
Earth-centered inertial (ECI) coordinate frames have their origins at the center of mass of Earth and are fixed with respect to the stars. [1] " I" in "ECI" stands for inertial (i.e. "not accelerating "), in contrast to the "Earth-centered – Earth-fixed" ( ECEF ) frames, which remains fixed with respect to Earth's surface in its rotation ...
The primed frame moves at 40% of light speed, and the double primed frame at 80%. Note the scissors-like change as speed increases. An observational frame of reference, often referred to as a physical frame of reference, a frame of reference, or simply a frame, is a
"Frame of Mind" is the 147th episode of the American science fiction television series Star Trek: The Next Generation, and the 21st episode of the sixth season. Written by Brannon Braga and directed by James L. Conway, it first aired on May 3, 1993, and focuses on First Officer Riker as he grapples with conflicting realities.
The gap between the 1986 film Star Trek IV: the Voyage Home (2286) and the 1987 first season of The Next Generation (2364) is 78 years by this timeline, matching early press materials. A gap of 10 years passed between the broadcast of the last episode of Star Trek: The Original Series and the release of The Motion Picture.
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