Very helpful.  Thanks. A followup and a new question:

> > 2)But then when I click Polar Projection & Show all Sky, Polaris 
> > is no longer at the top?  Why not? What causes the chart to move?
> 
> Whether you use polar or zenithal projection, when
> you click Show all Sky, the center of the previous chart will be 
below
> center.
> 
Regarding this, I am still not sure what is happening.  Here are my 
steps: 1) Set to Show all sky and put South at the bottom (so all 
looks ok with Ursa Minor in the middlke of the top half of the chart 
sincee I am in Chicago lat about 42; 2)if click Polar/Zenith toggle 
button back and forth, both look OK;3)but if I click Polar then go 
dorectly to Show All Sky, Ursa Minor appears to the right and my 
bottom is at 280 deg. Why does it move like this?  In order to get 
back to what I want, I have to hit the South horizon button again.  
Is my sequence of steps just unrelated and I should focus on getting 
either the projections OR the show all sky to look like what I want 
and not worry about what happens when I switch back and forth?

New question: I know from the local newspaper that Saturn will be in 
best view this week.  Is there anything in CDC that would alert me to 
this?  If not, that means I still have to rely on outside sources for 
these alerts, correct?

Thanks!
Alan 





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