[AZ-Observing] Re: Messier 2 Declination Error

AJ,  I'll check this tonight with my old Sky Commander on the 14".  I'll 
locally align on other objects in the area like M15 and M72.

----- Original Message ----- 
From: "AJ Crayon" <acrayon@xxxxxxx>
To: "SAC Forum" <sac-forum@xxxxxxxxxxxxx>; "AZ Observing" 
<AZ-Observing@xxxxxxxxxxxxx>; "EVAC Forum" <evac@xxxxxxxxxxxxxxxxxxxxxxx>
Sent: Monday, July 28, 2008 1:46 PM
Subject: [AZ-Observing] Messier 2 Declination Error


> Has anyone had problems locating M2 with digital setting circles or a GoTo 
> system?  This involves any of the electronic systems.
> I have run across declination errors with this entry on the XP4 Flash Sky 
> Commander digital setting circles and on Orions SynScan GoTo system. 
> Reason is because the declination is -0° 49' and the way computer hardware 
> handles -0.  Turns out most computers convert -0 to +0 resulting in 
> incorrect calculations.
>
> I corrected my version of XP4 with an update the the Messier catalog when 
> this was discovered some time ago.  I have just found the problem in the 
> SynScan system and notified Orion this morning.
>
> So, I ask, has anyone else had problems with their system finding M2?
>
> AJ Crayon
> Phoenix, AZ
>
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