Please give it a try and let me know what you think, please give me ideas for improvements and bug reports.
I don't use Windows so I can't try it, but your images are quite nice.
For distribution, I assume you provide your app for download as a codesigned installer (eg, use Inno Setup to create the installer .exe). Many users these days are very reluctant to download and install anything less than that from the Web.
It looks like you have some nice technology in your app that does the streaming of the updated images. Have you considered repurposing that technology into something less passive and more active for astronomers and enthusiasts to use? The iPad is a popular devices among amateur astronomers because of its portability and apps like Sky Safari. Maybe that would be a good target.