A bit of history this week but with a practical outcome for 2019.   Up to 1582, Europe used the Julian calendar introduced by the Romans in 45BC. Unfortunately, the Julian calendar differed from the solar calendar by 11 ½ minutes; after 500 years this small difference meant that the Julian calendar was 10 days off the solar calendar.   To remedy this error, Pope Gregory introduced the Gregorian calendar in most of Europe under his influence, 1582. There was a notable exception, you guessed right, the British Empire. Sound familiar?   The Brits stoically maintained their use of the [...]