Mito - your GUI designer/s need to be congratulated. That's a seriously lovely piece of work. Well done
I'd love to be able to embed that in an external astronomy club website for visitors to use - with full credits to you showing, of course. If you ever consider that notion it might be very well received by far more people that might ever stumble on your website alone.
Secondly, could you include a few Australian cities in your observatory lists?
Excellent work - beautiful!