[AZ-Observing] Re: Messier 2 Declination Error
- From: "Paul Lind" <pulind@xxxxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Tue, 29 Jul 2008 11:27:22 -0700
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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