This ancient rhyme is good for working out how many days there are in each month. Assuming, of course, that you can remember the rhyme itself . . .
Thirty days hath September*,
Some others, and maybe November.
Quite a few have thirty-one –
But which, I can’t remember.
* Just to confuse matters further, a 15th century manuscript (Harley 2341) in the British Library has November here!