Board Thread:Questions and Answers/@comment-25739032-20141215222927/@comment-12959254-20150524142647

ADour wrote: Most of the time is completely random.

Sometimes, they do make some sense. Earth-1983 is named after the year Spider-Man and his Amazing Frieds finished; Earth-67 is named after the year the first Spider-Man animated series premiered, etc. Actually they are not random, most of them is named after the issue and the year they appeared. For example Earth-97899, it appeared in the year 1997 and the What If issue it appeared is issue #99. Or Earth-120703. It first appeared in 2012, in July 3. Or Earth-15340. There are other examples too. So, most of them is makes sense, not random.