I took a daylight version as well:
The night version was a 15 second exposure; my camera has a panorama setting which I used to align the images. It may also create the panorama image automaticaly but I would need to read the instructions for that !
Canons come with a panorama program which is quite basic; if you look around the web there are other programs that just do that.
I did this one with ImageMagick and my old Fuji camera:
The original images aligned before the crop:
// Original image manipulation
exec("convert 17.jpg -resize x380 -rotate \"-6\" 17.png ");
exec("convert 16.jpg -resize 500x500 16.png ");
exec("convert 15.jpg -resize x370 15.png ");
exec("convert 14.jpg -resize x365 14.png ");
// Combining the images
exec("convert -size 1700x500 xc:white 17.png -geometry +0+0 -composite 16.png -geometry +395-19 -composite 15.png -geometry +780-35 -composite 14.png -geometry +1130-82 -composite panorama11.jpg");
//Cropping and resizing the final image
exec("convert panorama11.jpg -crop 1220x269+300+15 panorama12.jpg");
One thing I have noticed is that you lose a lot of the top and bottom of the photo when cropping. Next time I want to try two other things - Zoom out more so you have more forground and background you can crop off and take the photos in portrate mode. Again this will give you more you can crop off but you need to stich more photos together.