Arduino Astronomical clock for automatic light control

Here’s a project log covering the build of  an Arduino Astronomical clock for automatic light control by Paulo Oliveira:

My objective with this project was to build a system that, given my latitude and longitude coordinates and the current time/day of the year, automatically calculates the sunrise and sunset times, controlling the lights accordingly. There are of course commercial products that do this (see this one from Amazon for example), but it is so much more fun to build one:)