Going back to the earlier question zyzygy, I, like ssmart, who gave the answer - where did you find it? - can't find it in any dicitonary spelt with a z. It's correctly spelt syzygy. I'd be interested...
In 'She Stoops to Conquer',Oliver Goldsmith has Mrs Hardcastletell Mr H: '... you may be a Darby but I'll not be a Joan."Can somebody please give the origin of the term Darby and Joan?