Is there a PDF viewer with a vertical split screen feature? I have a very wide PDF and I would like to find a PDF viewer which would allow me to split the screen vertically so I can keep the left side the same while scrolling the right side back and forth.

I found the application http://skim-app.sourceforge.net/, but it only allows one to split the screen horizontally.

Is anyone aware of such a PDF viewer on the Mac?
You can take a snapshot in Skim (File -> Take Snapshot), then using the wonderful ShiftIt move the snapshot and the main view of the pdf to the opposite sides of the screen (vertically) with just a few keystrokes. Or horizontally. Or to all four corners if you want.