This year is a leap year, but they don't always roll around every four years

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One of the earliest calendars to deal with the differences between time and the seasons was developed under the rule of Julius Caesar in 68 BC.At 365.25 days it was between a sidereal and tropical year. "They got that wrong a couple of times at first, but they got it all ironed out by about 8 AD," Dr Horner said."If you add one day every four years, you're adding slightly more time than you need."

So in 1582 Pope Gregory XIII shifted the dates back by 10 days and came up with a new calendar that all countries use today.This refines the number of days in a year down to 365.2425 days. "Which is almost, but not exactly the same as 365.24219, but it's close enough that for hundreds, if not thousands, of years it will be bang on before starting to drift."Under the Gregorian calendar a leap year must be able to be divided by 4 and by 100.So, for example, the year 2000 was a leap year — it can be divided into 500, 20 and 5.That means leap years will continue to happen like clockwork every four years up until 2096.

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