Back to Home

ATM Forum Message

Forums: Atm · Astrophotography · Blackholes · Blackholes2 · CCD · Celestron · Domes · Education
Eyepieces · Meade · Misc. · God and Science · SETI · Software · UFO · XEphem
RSS Button

Home | Discussion Forums | Amateur Telescope Making | Post

Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...
The Space and Astronomy Agora
Re: Right Ascension

Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To
Posted by Robert May on February 2, 2000 19:19:34 UTC

That is the traditional definition of the 0 hour of RA. If we kept with that strict definition then the position of 0 hour will change every year as the sun does move a bit every year. This would make it impossible to locate items (Declination also moves around) to the required accuracy. As a result of this realization, a particular point in the sky has been defined as being 0 hour, 0 dec. As long as you think that the position of anything is dependent upon what some repetitive thing (like the annual crossing of the equinox) then you will be confused as you are trying to redefine something that can only be defined once. It would be like saying that next year is 1A.D. because it is the next year.

Follow Ups:

    Login to Post
    Additional Information
    About Astronomy Net | Advertise on Astronomy Net | Contact & Comments | Privacy Policy
    Unless otherwise specified, web site content Copyright 1994-2022 John Huggins All Rights Reserved
    Forum posts are Copyright their authors as specified in the heading above the post.
    "dbHTML," "AstroGuide," "ASTRONOMY.NET" & "VA.NET"
    are trademarks of John Huggins