File > Scripts > Load Files into Stack
and then try selecting all the Layers and using
Edit > Auto Align Layers
For the slideshow you may want to look into Frame Animation in the Animation Panel (see the Help).
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File > Scripts > Load Files into Stack has an option that will attempt to auto align images. However it will most likely fail if the focal lengths used varies by a lot, Different Focal length will produce images where an object like a mountain will be different in size and perspective. Beside parallax errors object will have a different perspective for example the distance between object I believe will be different when you use different focal length. Once you stack the Images you can transform layers to try to match object sizes and align layers. You can then do a center Crop so no layer will have a transparent short side. You could then use the Animation Palette and use its fly-out menu to have Photoshop make frames from the layers. View the animation and if it looks good you should be able export the Frames a sequence of images. Do not save an animated GIF. The GIF file format standard only supports 256 colors I'm sure you will want more colors to show all four seasons well. Photoshop versior prior to CS5 also had a PDF presentation feature you could even add transitions between slideshow images. That feature was accessed through menu File>Automate>PDF Presentation. And the feature was removed is CS5 and is not an available download optional plugin. Bridges output module PDF feature is lame in comparason seems to be aimed at only replaceing contact sheet II which was also removed but can still be downloaded and installed.
Thanks so much c. and jj. , I will try this out.