Earth is mot exactly a sphere - spinning on the axis makes it a little larger around the equator than at the poles. Thus, at the poles the mass in question is slightly closer to the center of the earth. Since gravity acts as though attraction is at the centers of mass, weight would be slightly higher at the poles, less at the equator. Same thing happens on mountain tops vs deep valleys.
As far as rockets are concerned, it is the mass of the burning gasses ejected out the nozzle that causes the motion. "For every action, there is an opposite reaction." Gasses eject in one direction driving the rocket in the other. No need for an atmosphere to push against.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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