[AZ-Observing] Re: Polar Alignment
- From: "Richard Harshaw" <rharshaw2@xxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Thu, 18 Mar 2010 12:20:56 -0700
I don't know if it was clear from my Telrad reply, Jack, but I look for
Polaris to stay in the same gap between the inner and middle rings, not that
it stays put while I rotate the axis.
Dick H
-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Jack Jones
Sent: Thursday, March 18, 2010 10:11 AM
To: az-observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Re: Polar Alignment
No it's whatever the mount is aligned with, whether it be the pole, Polaris,
or an antenna on a distant mountaintop. Everything is set at zero or
90.0000000000 degrees. Center it in the eyepiece on one side of the mount,
flip it over and is it still centered. Will the object stay stationary and
spin or will it inscribe a circle, that's all I'm asking. I think it is as
you say, the difficulty in zeroing the mount in both axes (aligning the
mount with a given object in all planes?). Some scopes you have to eyeball
it. That's what I've seldom seen or had the patience to do and so the fault
was not with the mount.
Jack
Michael Collins wrote:
> Because Polaris isn't precisely at the pole, it will shift in position
> within the field of view if the mount is aligned on the pole. It's
> distance from the center of the field should remain constant, however.
> The test you describe would work only if you aligned the axis of the
> mount to Polaris, but even then it won't guarantee that the two axes are
> orthogonal (because it might be good in that plane and off in others).
>
> -- Mike --
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