At Home Astronomy
There are 10 activities at At Home Astronomy that you can do at home (naturally!), from learning about the order of the planets in our solar system to building a lunar settlement and finding out where the sun is and even calculating how big it is.
The site is made possible by the Center for Science Education at Space Sciences Laboratory, University of California at Berkeley, and exists to provide families with instructions for hands-on science experiments.
Each project has links for further research and more details. In the case of the astrolabe for instance (that's a device used for measuring altitude, including the height of objects in the sky), you not only learn how to build and use it, but you also get links to Encyclopedia Britannica for the history behind the device and to a page called astrolabes.org which provides an overview of astrolabe principles.
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