If you expect the light level to change while you are shooting (eg if it is before astronomical twilight) it would be easier to stitch if you started at one side and worked across. I'll admit that's hard work doing it by hand, and auto panorama heads aren't cheap.
1 4 5 8
2 3 6 7
and so on.
Or use a wider angle lens. A 20mm would cover about the same area as four 40mm frames. On my gear a 40mm covers close to 33x22 degrees. A 20 mm does 66x44 degrees. That would do your pano in one pass.
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