Mathematics would develop more slowly, as much of it came from calculating positions of stars and planets. Or sense of time would also be less exact, with no sunrises or sunsets, sundials, and no precise way to tell equinoxes, etc. Navigation would be much more difficult, even after the invention of magnetic compasses.

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"If this were play'd upon a stage now, I could condemn it as an improbable fiction."
Shakespeare, Twelfth Night
Illuminati's Razor-The most complicatedly evil answer is usually the most correct answer. - Fazor
"Every book is a children's book if the kid can read." - Mitch Hedberg
"Distance doesn’t matter much in space, where if you just start a thing off with the right kind of shove, sooner or later it will get where you want it to go." -Frederik Pohl, Mining the Oort