Earth Map Desktop

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Here's a world map showing current sunlight and cloud cover.

Here's a shell script to download the image:

#!/bin/sh
curl -o ~/Pictures/earth/earth.jpg http://www.die.net/earth/rectangular_1600.jpg

Here's a tool (Cronnix) to add a shell script to the crontab so it runs every 15 minutes (use 0-59/15 for the minutes section, and * for the rest).

Then in System Preferences, set the Desktop picture to ~/Pictures/earth, set it to change every 5 mins, and you have a desktop picture of the Earth that updates every 15 minutes.