[Aavso-photometry] Bruce Gary's book and other material

[Bill Goff]

Michael,
The meridian overlap zone is determined by tube length and the amount  
of offset between to polar axle and the tube itself.  On my mount, I  
have only 7 degrees of movement past the meridian before the tube  
hits the pier or the tube saddle hits the mount.

Bill
On May 14, 2008, at 11:31 AM, Michael Koppelman wrote:

> I've never understood those GEMs (like the Paramount) which force you
> to move the scope the moment it hits the meridian. A GEM can traverse
> the meridian and doesn't need to be moved for hours afterward. You can
> start 3 hours on one side and end 3 hours on the other. GEMs do not
> perform poorly at the zenith.
>
> I'm not religious about this mount versus that mount but I have had
> great luck with GEMs.
>
> M.
>