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The further a target is from either celestial pole the shorter your max sub
length can be, so for example the Large Magellanic Cloud is about 18deg from the Southern Celestial Pole, so you will get nice long subs. The constellation of Orion is as far as you can get from either celestial pole,[like the equator on earth] so you will get the shortest possible max length subs.
Andromeda is about 38deg from the North Celestial Pole, so your max sub length will be slightly better than half way between the min and max possible.
This has nothing to do with magnetic N or S poles on a compass, so shooting
east or west or north or south is irrelevant. It is the target's distance from its
nearest celestial pole that decides max sub length. You can see the celestial poles on any star chart or planisphere.
raymo
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