The Movie Timeline - of all the movie timelines on all the net, you walked into this one
2001: A Space Odyssey - timeline
Aliens leave monolith on Earth.
The Monolith tinkers with the man-ape brain. (Olduvai Gorge, Africa)
Sunday 12th January: HAL 9000, Artificial Intelligence Computer System, becomes operational.
Sunday 12th January: Good afternoon, gentlemen. I am a HAL 9000 computer. I became operational at the H.A.L. plant in Urbana, Illinois on the 12th of January 1992. My instructor was Mr. Langley, and he taught me to sing a song. If you'd like to hear it I can sing it for you... (Urbana Illinois)
A monolith appears on the moon.
Thursday 12th April: A monolith is found on Jupiter.
Friday 13th June: Gigantic monolith found in orbit near Jupiter's moon Io.