1. Home
  2. Education
  3. Space / Astronomy

Right Ascension

by Nick Greene
for About.com

Definition: Right Ascension: Coordinate for measuring east-west position for an object in the sky. Measured in Hours, Minutes, and Seconds, it is the arc between the zero point of right ascension (the first point in Aries, just as the zero point for longitude on the Earth is the prime meridian) and the object.
Explore Space / Astronomy
About.com Special Features

Tips that will help finance your education, excel in the classroom, and advance your career. More >

Being well prepared is the first step; here are more essential suggestions. More >

  1. Home
  2. Education
  3. Space / Astronomy
  4. Astronomy and Space Basics
  5. Glossaries
  6. Astronomy Dictionary
  7. Right Ascension - Space and Astronomy Definition - Online Dictionary and Glossary Definition of Right Ascension

©2009 About.com, a part of The New York Times Company.

All rights reserved.