Don’t miss today’s Leap Year Martini, created by Harry Craddock for the Leap Year celebrations at the London Savoy in 1928, as you only get to try it once every four years.
The calendar year is based on the astronomical year but because the astronomical year doesn't repeat in whole days, over time, the two fall out of sync. This is corrected by adding a day to the year every four years. It's called a leap year because while a fixed date advances one day of the week from one year to the next, in a leap year it advances by two - it leaps over a day in the week. So, if Christmas is on Friday one year it will be on Saturday the next, but if it was a leap year it would jump to Monday.