What is the reason for why February has an 'r' after the 'b' but January doesn't have an 'r' after the 'n'? Like so: Janruary, February. There must be an explanation for this, historical or otherwise.
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In the Roman calendar January was the month of Janus, the god of gates and doorways (janua), this month being the "doorway" to the year. February was the month of purificatory rites, februa.
Because of the history:
A History of the Months January -- Janus's month
February -- month of Februa
The original LATIN word from which they were created show this.