On 09/05/2015 11:09 AM, Chris Maness chris@... [xephem] wrote:
Strangely, xephem disagrees with Cartes du Ciel on Polaris' RA/DEC,
but agree exactly on AZ/EL. How could this be?
First guess would be an epoch mismatch. RA/Dec changes over time, so you need to be sure that xephem and Cartes du Ciel are telling you the RA/Dec at the same epoch and equinox.
- Ernie
