The Sirens of Titan (Kurt Vonnegut, 1959)

Winston has flown his craft into a chrono-synclastic infundibulum, and been converted into pure energy. Materializing only when his waveforms intercept a planet, he only gets home once every 59 days. But at least it's some consolation that he knows all that ever has been and all that ever will be.

From the same author:
Breakfast of Champions
Slaughterhouse 5