This decimal clock was made by Pierre Daniel Destigny in Rouen, France, between 1798 and 1805. | DeFacto, Wikimedia Commons // CC BY-SA 4.0 Everybody knows that there are 24 hours in a day, 60 ...

In a decimal system, we could divide each day into ten “decidays”. A deciday would comprise 10 “centidays” or 100 “millidays” – each milliday would be 1,000 “microdays”, and so on .