I saw this a while ago and my question is the same as before - anyone know a Linux equivalent?
Armed with location and time, program already knows how much sunlight there should be (plus-minus some error) and then the daemon slowly changes the color temperature of the monitor...
There's a Linux link on the page. It works on 64-bit too.
Of course it would work on amd64 if you have also 32-bit userspace (ie multilib support) installed and 32-bit emulation enabled... but I don't.