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John, you wrote:
"I worked with it for quite a while. I have a few comments/suggestions if you 
don't mind my input. I hope these comments are useful and help you improve 
the tool (you called it a toy, but no, not a toy at all in my view)."

I don't mind the comments at all, in fact I am hoping for input from the rest 
of the NavList, so I can get the best possible result at the end.  


Then you wrote:
"1) I think the ability to rotate the star field and also the way you show the 
display of the sun position are both wonderful ideas. But I noticed that when 
you rotate the star field, the vernal equinox on the sun display does not 
rotate with them, which it should. The VE (Aries) should always be at SHA=0 
deg."

This is an outcome of the methodology of development.  At first, I wanted to 
create actual blue overlays for every degree of latitude, to eliminate harm 
to electrons.  However, I quickly realized that I wasn't going to be able to 
manufacture them correctly.  As such, I began to throw in some artifacts such 
as the rotating stars and the sun on the ecliptic.  I never bothered to link 
them all in one cohesive model but I can already see how to do it

Then you wrote:
"2) The GHA slider is not aligned correctly with Aries. Try this: Set the 
latitude to 45 degrees N to deform the blue overlay enough to identify the 
centerline which is 180 degrees or due south (this is the blue line that 
points directly away from the north celestial pole - on your real 2102-D it 
has an arrow on it that points at the LHA). Next, set "day of year" to 79 
which is the day of the vernal equinox (March 20), then adjust the GHA slider 
so that the 180 degree line of the blue overlay crosses the center of the 
sun. Note that the GHA value is shown as 102 degrees, but it should read 0 
degrees in this case."

This is why I called it a toy, these details need to be adjusted so it is 
technically accurate.  Again, this is a function of the disjointed 
methodology of development.  I think I can accomplish this though. 

Then you wrote:
3) Again regarding the "GHA Aries" slider, I think this should be labelled 
"LHA Aries", and the range of the slider should be 0-360 deg with the blue 
overlay rotating once (currently it goes from 0-180-0-180-0 and the blue 
overlay rotates twice through the slider range).

Just me having fun.  It originally went around 5 times but that just made me dizzy!


Then you wrote:
"5) The star field is displayed differently than on a 2102-D "

This is an easy fix. 

Then you wrote:
"6) Would be nice if the correct hemisphere (for the stars) could be taken 
from the latitude slider rather than the N/S radio buttons, so you don't 
accidentally have the latitude slider in the S hemi and acidentally leave the 
stars in the N hemi configuation (yes, this is getting picky, sorry)."

That was deliberate.  I wanted to see the blue overlays work when you were in 
the southern hemisphere and using the northern base.  This is something the 
2102D never did, but is a mathematical curiosity.  It is quite interesting to 
see them turn "inside out" as the zenith crosses the equator.  The surprising 
blue overlay for 90 degrees S on the northern hemisphere base is correct if 
you think it through.  If the NavList hasn't tried it, I urge you to do so.  
What shape do you think it might be?


Then you wrote:
"7) The Blue overlay doesn't seem to work correctly in S hemisphere latitudes."

I can't see what you mean here.  Would you care to expand on this?

Thanks again for your input.  It is appreciated and taken in the proper spirit and intention.

Best Regards
Brad



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