Easy Auto-Update Sunlight Wallpaper

I used a post at Lifehacker to create my own, auto-updating, sunlight tracking wallpaper.
It is quite easy. It assumes that your Pictures directory is located at ~/Pictures. Change it in the script if yours is different. Just put it anywhere and execute it. If it doesn’t execute, just chmod +x changer.
Here is the script:
#!/bin/bash
cd ~/Data/Pictures/Wallpapers/
if [...]