May 20: on this day in history

Historical events

1. 325Christianity's first ecumenical council met at Nicaea, now İznik in Bursa province.
2. 1570Abraham Ortelius published 'Theatrum Orbis Terrarum', regarded as the first modern atlas.
3. 1609Shakespeare's sonnets were first published as a book in London.
4. 187517 countries signed the Metre Convention, and the meter became an international unit of measurement.
5. 1964Scientists discovered the cosmic microwave background radiation, considered an echo of the Big Bang.

More days in May

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