Well it's not science so there technically isn't a correct answer. But a logical perspective on the cinematics show that the OPs original mathematics (although correct based on the image of the ship in the rings) does NOT fit logically into what is depicted in the cutscenes. The Dreadnaught in the cutscenes is much closer to the size of a small city based on the size of the Tomb Ships. Probably almost akin to New York City and the island of Manhattan.
English
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Maybe Saturn shrank sometime in the next 700 years?
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Very true. But that would only make OP wrong yet again. In that case, the Dreadnaught STILL isn't as big as he thinks
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Maybe we're throwing poo at the walls to cover for Bungie's obvious cinematic inconsistency, because we have nothing else to do for the next three days? LOL... "There is no excuse for this, but by god I will argue it... because it's the internet!!!"
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