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Superman - timeline
June: A boy reads a Superman comic.
The planet Krypton explodes.
According to Lois Lane's article, "I Spent the Night with Superman", Krypton explodes - baby Kal-El spends the next four years in a space ship while travelling to Earth. (Krypton)
The planet Krypton explodes (Krypton)
Kal-El arrives from Krypton. (Smallville, Kansas)
Superman's rocket lands on Earth (Kansas)
A spaceship crashes carrying a strange visitor from another world. (nr Smallville, Kansas)
Superman appears for the first time. (Metropolis)