Asteroids Clusters Comets Concepts Constellations Galaxies Moons Nebulae Planets and Moons Stars Surface Features

Menus

Catalogues

Tools and Links

Right Ascension
RA
The celestial equivalent of longitude. The Celestial Sphere is subdivided into twenty-four hours, starting at the First Point of Aries in Pisces.
Indexes
  • Main Index
  • Concepts Index
  • Related Entries
  • Leo
  • Monoceros
  • The Plough
  • Serpens Cauda
  • Winter Hexagon