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What (who) is rational horizon - definition
TYPE OF CELESTIAL COORDINATE SYSTEM THAT USES THE OBSERVER'S LOCAL HORIZON AS THE FUNDAMENTAL PLANE
Altitude and Azimuth; Celestial horizon; Rational horizon; Rational Horizon; Altitude (astronomy); Horizon coordinate system; Horizon coordinates; Horizon Coordinates; Azimuth-elevation coordinates; Topocentric coordinates; Topocentric coordinate system; Elevation (astronomy); Altitude angle; Altazimuth coordinate system; Angular altitude; Celestial altitude; Horizontal coordinates; Apparent height
![north]] point (sometimes from the [[south]] point) of the [[horizon]]; altitude is the angle above the horizon.](https://commons.wikimedia.org/wiki/Special:FilePath/Azimuth-Altitude schematic.svg?width=200 "north]] point (sometimes from the [[south]] point) of the [[horizon]]; altitude is the angle above the horizon.")
Horizontal coordinate system
The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane to define two angles: altitude and azimuth.
Rational egoism
ETHICAL THEORY
Rational selfishness; Rational egoist; Rational self-interest; Rational Selfishness; Egoism (rational); Rational self interest
Rational egoism (also called rational selfishness) is the principle that an action is rational if and only if it maximizes one's self-interest.Baier (1990), p.
Particle horizon
THE MAXIMUM DISTANCE FROM WHICH LIGHT FROM PARTICLES COULD HAVE TRAVELED TO THE OBSERVER DURING THE AGE OF THE UNIVERSE
Cosmic light horizon; Conformal time; Cosmic horizon
The particle horizon (also called the cosmological horizon, the comoving horizon (in Dodelson's text), or the cosmic light horizon) is the maximum distance from which light from particles could have traveled to the observer in the age of the universe. Much like the concept of a terrestrial horizon, it represents the boundary between the observable and the unobservable regions of the universe, so its distance at the present epoch defines the size of the observable universe.
Wikipedia
Horizontal coordinate system
The horizontal coordinate system is a celestial coordinate system that uses the observer's local horizon as the fundamental plane to define two angles: altitude and azimuth. Therefore, the horizontal coordinate system is sometimes called as the az/el system, the alt/az system, or the alt-azimuth system, among others. In an altazimuth mount of a telescope, the instrument's two axes follow altitude and azimuth.
