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This looks cool! So you take a picture with a web cam every couple of minutes or something?
Yip, once a minute between sunrise and sunset (now) and then run a little script to turn it into a video, and then use a nice little cli (googlecl) to upload it to youtube (though that has been slightly tempermental). It's really really straightforward. Basic instructions here: http://wiki.psdavey.com/my-setup-for-timelapse.html
And today was really quite nice too :) https://www.youtube.com/watch?v=DBxa59p8zcU