This started as an example for classes, as many projects seem to do. The old home of ITP at 721 Broadway in New York was oriented on an east-west axis, so I set up a moving spotlight, and programmed it to move with the sun.
The controller for the spotlight is a networked microcontroller that takes the spotlight’s latitude and longitude, then gets the date and time from the internet, and looks up the sunrise and sunset times. Then it moves the spotlight to a position that corresponds to the sun position, rising on the eastern side of the space, and setting on the western side. The technical details can be found in the project’s repository.