AstronomyPictureOfTheDay is an Automator workflow for changing your macOS desktop background based on the Astronomy Picture of the Day feed.
I have been using an Automator workflow inspired by an article by Andy Ihnatko to download the latest image from the Astronomy Picture of the Day site and set it as my desktop background. It also adds a copy to my screen saver images folder. Some of the pictures are pretty, and some are inspiring.
Check it out, if you are interested.