“Only Time is universal; Night and Day are merely quaint local customs found on those planets that tidal forces have not yet robbed of their rotation. But however far they travel from their native world, human beings can never escape the diurnal rhythm, set ages ago by its cycle of light and darkness.”

“Only Time is universal; Night and Day are merely quaint local customs found on those planets that tidal forces have not yet robbed of their rotation. But however far they travel from their native world, human beings can never escape the diurnal rhythm, set ages ago by its cycle of light and darkness.”

— Arthur C. Clarke