shooting - sun set sequence

I have story boarded a sun set sequence to act as an intro to my film. i got home early from work and have been thinking about how i am going to do this as i have thought about one major problem.
when using the digital slr camera to shoot the entire sun set i will have to make adjustments as i go according to the changes of light. i cant just point and shoot using a pre set mode for example the scenery setting as it will randomly adjust its self for each photo. so when shooting it i will have to set up the correct shutter speed, aperture ect and then change it constantly and regularly in time with the changing of the light out side for it to look smooth. i will have to make consistent changes to the camera and also use my judgment. i gave it a go as it was still light even tho it was just a grey day i wanted to see if i could do it. bellow are only just a few bits from the sequence i shot...








I was amazed with how it came out, by pure chance there happened to be a really nice sun set. the sequence of photos look good and i noticed when i changed the exposure each time there was a slight change in brightness but only with the first few photos of that particular exposure setting. so each time i changed the exposure i will delete the first few photos to make it look more seamless and smooth.
Bellow is a video of all the pictures, i have not deleted the needed pictures so its really obvious where the changes in brightness are. this is a really slow version of the clip just for my benefit and curiosity to see how it looks. It looks dramaticly better when its a lot faster.