The Equatorial Coordinate System

Highlights

• ›RA and Dec on the projected terrestrial equator — tied to an epoch

Related systems & concepts

• Right Ascension
• Declination
• The International Celestial Reference System
• The J2000 Epoch
• Proper Motion
• Parallax

Across the reference systems

• The Celestial Sphere
• Right Ascension
• Declination
• The Galactic Coordinate System
• The Ecliptic Coordinate System
• Precession
• The Aberration of Light
• International Astronomical Union (IAU)

Knowledge connections

• Associated withThe Celestial Sphere
• Associated withRight Ascension
• Associated withDeclination
• Associated withRight Ascension
• Associated withDeclination
• Associated withThe International Celestial Reference System
• Associated withThe J2000 Epoch
• Associated withProper Motion
• Associated withParallax
• Associated withThe Galactic Coordinate System
• Associated withThe Ecliptic Coordinate System
• Associated withPrecession
• Associated withThe Aberration of Light
• Associated withInternational Astronomical Union (IAU)

Sources

Facts on this topic will be cited from these primary and reference sources.

• IAUInternational Astronomical Union

  Official naming, definitions, constellation boundaries, and astronomical nomenclature.