I've been trying to reach my latest goal: Science Victory before the 20th century (turn 320). I can pretty reliably launch my spaceship between 1905-1930, depending on how many RAs I can get and what my landscape looks like, but I haven't been able to break that 1900 barrier. Usually I beeline for Education and get it somewhere around turn 150 or so (not 100% sure on that but I usually have it before 1AD for sure). My scientific progress tends to stall here because Education comes at the point in the game where growth and building tends to be anemic where your economy/happiness is playing catchup to your technology, population growth and cities. This makes it hard to build Universities quickly. I get another bottleneck where my Science is way ahead of my culture, and I have to choose between filling Rationalism and filling another policy tree (usually Tradition). This is especially a problem if I don't meet any Cultural CS's near my Civ. The other problem I have is that I tend to get only a limited amount of cities because I have to tiptoe around the AIs who aren't too keen on me gobbling up large swaths of my home continent, especially if they happen to be ON said continent. This makes getting RAs a bit more difficult later on. I usually play Babylon (although I got close with the Americans the other day too, Minutemen are OP, just ask Ghengis Khan). My map settings are Standard speed, Continents, Standard size, and Prince Difficulty.