Hello Bill, hello Larry,

I just experimented a little more with the PA in geomode and got the following:

there is no bug! I had my last map rotated by 8 degrees and forgot about it,
because also the CCD frame was rotated 8 degress in the opposite direction so
that the frames edges were parallel to the border of the map. Because I used a
zenith up orientation the compas rose in the legend was rotated too and I didn't
realized the additional rotation of 8 degrees.

When changing to geomode, Level 1 is set by default. And there is no rotation.
But whenn zooming in, the rotation is set to the value which was in the star map!

And that I didn't realize. Because we have no borderlines parallel of longitude
here in Germany the effect of a rotated map by 8 degrees was not conspicious.

> I just tried this and got 180 and 360 degrees,
> depending on N or S direction. With G8 set to a
> 10 degree field, the measurements usually varied
> plus/minus 0.1 degree. With G8 set to a 15'
> field for better accuracy, the measurements were
> always dead on. I tried all three projections
> with no difference. I'm in the US, and used the
> Eastern borders of Utah and Arizona, which fall
> on the same parallel of longitude. Can't think of anything else to check.

> >I just discovered the following:
> >When measuring in geomode (right click and move the mouse) the position
> >angle is always about 8 degrees to small (e.g. 352° when measuring a vertical
> >line up (north), 172° when measuring due south (should be 180°)). There is no
> >difference wether I measure in the center of the image or at the right or left
> >border. I measured in the north western part of germany (8 deg east, 52 deg
> >north) with a field size of 1 deg. The projection is stereographic.
> >
> >Is this a bug or do I misinterpred the meaning
> >of the displayed PA? What is the
> >reference, geographic north or something else?

But my question related to this topic isn't answered yet: Will be (or perhaps is)
there a way to change to geomode without changing the time?

Clear skies
Bernd

Bernd Brinkmann

Sternwarte Herne, MPC code A18
Herne, Germany

e-mail: info@...
http://www.sternwarte-herne.de