[sac-forum] MESSIER 2 declination error
- From: "AJ Crayon" <acrayon@xxxxxxx>
- To: "AZ Observing" <AZ-Observing@xxxxxxxxxxxxx>, "SAC Forum" <sac-forum@xxxxxxxxxxxxx>
- Date: Tue, 29 Jul 2008 10:04:09 -0700
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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