The design is basic. But that makes it really good. When you look at a star chart, you really only want the star chart. This is an example of effective design. The design should be driven by the goal of that page.
Be sure to play with all the different buttons at the bottom of the page. I especially like the settings document. You can change the latitude and longitude, and watch as the sky changes. You can also look at how the sky looks in different parts of the world from where you are. This is a fun site and
Have you built an HTML5 site? Or do you know of one that does a great job with HTML5? Submit HTML5 site designs to be featured on this site.