Astrolabes are models of the universe that you can hold in your hand. They allow you to predict the positions of stars, planets, and the sun based on the time of day and year. You can also use them to determine the time by observing the positions of the stars.

This Astrolabes is one I created using a laser etcher. It is based the software created by Richard Wymarc's Astrolabe Project, and there are detailed instructions about how to build it in my Instructables - How to Build a Customized Astrolabe project.

I've included all the files. If you want to get started, just try etching the mini_astrolabe.ai file on a single 11x14 piece of acrylic. The avery_circle templates are for putting color inset sheets between the clear acrylic. Again, take a look at the Instructable for details.

In the Instructable, there are templates you can use to etch and cut this design. You can also customize it for your location. There are also instructions about how to use it to determine the positions of stars in the night sky.

With the templates and the instructions, this is really easy and fun to build. Etching a full-size astrolabe takes about 1 hour, but you can create three mini-astrolabes using the template in about 30 minutes. The materials are two pieces of 11x14 acrylic (for the full size astrolabe) and a couple #6x32 screws and locking nuts.