call for help

From: Kevin Fetter (kevin_fetter@hotmail.com)
Date: Fri May 31 2002 - 21:24:05 EDT


Help

I have been talking to a guy at southern stars about the skychart program.

http://www.southernstars.com/skychart/index.html

It allows for showing the passage of satellite across the moon and 
background stars. I had problems with it not showing the satellites in the 
correct location before. But now they have improved the program in it's 
calculations of satellite positions. There is still a slight problem with it 
showing the position of the satellites.

Here is the problem

I like to watch satellites going across the disk of the moon.

I use rob's skymap to see where on the moon they will go across and then 
watch in my telescope. But I would like to do that also with skycharts.

So can my fellow satellite observers who use skymap give us a hand in trying 
to fix what might be a problem with skycharts, or either me. I find rob's 
skymap and the windows skymap at http://www.skymap.com , agree in the path 
across the moon. But skycharts is slightly off. Call me fussy, so be it. I 
find in both skymaps, the satellite goes across the unlit area of the moon, 
but in skycharts it doesn't, so what I am doing wrong, it must be my fault:)

Check to see what positions you get for the satellite and moon, in skycharts 
and rob's skymap. I find I get different positions, which would because I 
would think, by the way the programs calculate the info.

You will need to download the demo version, then download a patch to use the 
improved method of getting satellite positions using the improved SGP4/SDP4 
orbital model from my site. It is not on the skycharts site, as we are bug 
testing it before it goes there.

http://ca.geocities.com/kfetter/SkyChartIIIDemo.zip

Thanks for all the help you can give.

Kevin

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