Real sails can take you in any direction within a 270 degree arc, the 90 degrees you can't go being centred on the direction of the wind. This means you can sail upwind in a zig-zag fashion.
This is possible because of the water, a medium which prevents significant downwind drift because of the shape of the ship's hull: moving forward, the pointy end, is simply the path of least resistance. In space there is no second medium to drive through, so the only direction to go is with the force of the solar wind.
This is also why airships with sails could only go in the direction of the wind, like a hot air balloon. I was devastated when I worked that truth out, I tell you. So many rich plans...
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