juliangarnier/3D-CSS-Solar-System: Solar System data visualisation done in HTML/CSS and a bit of Javascript. @GitHub
CSS 3D Solar System
mpetroff/nightsky: An HTML5 night sky viewer @GitHub
Night Sky demo
more Astronomy resources
Many Eyes - One Vision | Las Cumbres Observatory
Night Sky Map & Planets Visible Tonight in Philadelphia @TimeAndDate (proprietary, useful)