system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: The words "September, October, November, and December" contain the latin roots for the numbers 7, 8, 9, and 10. So why do those months hold different positions in the calendar?
gpt
Because they originaly were 7th, 8th and so on month. Roman calendar had only 10 monts, before January and February were added. That shifted the order of the months by two but the names stick. Thats why September is 9th and not 7th now.