Combining two pictures

[moiremusic]

An easy way would be to rotate both images so they are horizontal, make them separate layers in the same document, lining them up as best you can, then applying Edit> Auto-blend Layers to the top layer, and hope for the best. This may or may not produce something suitable, depending on how critical you will be of the result.

Otherwise, you will have to get your hands dirty and do it manually... finding an area in one layer that would fit next to an area of the other, and either by using the eraser tool or a layer mask on the top layer, try to blend them together. Then doing quite a bit of manipulation to make the skies look like they are the same.

What is your level of skill using Photoshop?

[danlefeb]

Or you can go to File > Automate > Photomerge and try that route.

[moiremusic]

Ah, good point. I completely forgot about that.