"Encounter in the Dawn" is a short story by Arthur C. Clarke published in 1953 in the magazine Amazing Stories. It was originally collected in the anthology Expedition to Earth, and, in one edition of the book, is titled "Expedition to Earth". In a later collection the title "Encounter at Dawn" is used. The story was later restyled and used as the basis for the first section in Clarke's 2001 A Space Odyssey.
An editor at Ballantine Books gave it the ingenious title "Expedition to Earth" when it was published in the book of that name, but I prefer "Encounter in the Dawn." However, when Harcourt, Brace and World brought out my own selection of favourites, The Nine Billion Names of God, it was mysteriously changed to "Encounter at Dawn."