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Author note: The well-known rime about the Days of the Month was widespread in Medieval England, and came from the Latin. In Richard Grafton's Chronicles of England (1562) it appears in its present-day form except that there is no mention of any Leap Year -- a defect the students of St. John's College, Cambridge, remedied in their play, The Return from Parnassus (c.1600).
Nowadays Einstein's Relativity principle has got abroad, and [this] is an attempt to adapt the well-known rime to post-Einsteinian condtions. It endeavours to give expression to the fact that there are internal or subjective time and external or objective time. In the former some days are longer than others, and some months also. In Queensland the shortest months for teachers and pupils are December, May and January; hence the numbers in [this] modernisation.