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A year, occurring once every four years, that has 366 days including February 29 as an intercalary day.
‘A common misconception is that the Gregorian modification states that a year will be a leap year if it is evenly divisible by 4, unless it is evenly divisible by 100.’
‘But 1600 and 2000 were leap years, because those year numbers are evenly divisible by 400.’
‘To make a calendar even better, new leap year rules have to be introduced, complicating the calculation of the calendar even more.’
‘I know leap years are roughly every four years, but I think there are some that aren't like that.’
‘On the advice of a Greek astronomer, Sosigenes, he then [thereafter] started the leap year system.’
‘First I'll present the code, then the rules for calculating which years are leap years, and finally the code again but with extensive comments interspersed.’
‘Therefore, the year 2000 will be a leap year, but the years 1700, 1800, and 1900 were not.’
‘Our calendar year is either 365 days in non leap years or 366 days in leap years.’
‘To compensate for this discrepancy, the leap year is omitted three times every four hundred years.’
‘There is really no reason for deviating from normal programming approaches for performing leap year calculations.’
‘I could just divide the number of days by 365 if I did not have to account for those leap years.’
‘If the year is not leap year nor festival year, then print the line ‘This is an ordinary year.’’
‘The Gregorian calendar's rules for leap years have three parts.’
‘To get even closer to the actual number, every 100 years is not a leap year, but every 400 years is a leap year.’
‘This means that 1700, 1800, and 1900 were not leap years, but 2000 was.’
‘To make a calendar a better measure of the Earth's orbit around the Sun, leap year rules were created and have since been modified.’
‘If a year is divisible by 4 and by 100, it is not a leap year unless it is also divisible by 400.’
‘It uses a globally accepted algorithm for determining which years are leap years.’
‘Thus, 1600 was a leap year, and 2000 will be, too, but 1700, 1800, and 1900 were not leap years.’
‘Therefore, the years 1700, 1800, 1900 and 2100 are not leap years, but 1600, 2000, and 2400 are leap years.’
Origin
Late Middle English: probably from the fact that feast days after February in such a year fell two days later than in the previous year, rather than one day later as in other years, and could be said to have ‘leaped’ a day.