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A year, occurring once every four years, which has 366 days including 29 February as an intercalary day.
‘On the advice of a Greek astronomer, Sosigenes, he then [thereafter] started the leap year system.’
‘The Gregorian calendar's rules for leap years have three parts.’
‘To compensate for this discrepancy, the leap year is omitted three times every four hundred years.’
‘To get even closer to the actual number, every 100 years is not a leap year, but every 400 years is a leap year.’
‘To make a calendar even better, new leap year rules have to be introduced, complicating the calculation of the calendar even more.’
‘If a year is divisible by 4 and by 100, it is not a leap year unless it is also divisible by 400.’
‘Therefore, the year 2000 will be a leap year, but the years 1700, 1800, and 1900 were not.’
‘Thus, 1600 was a leap year, and 2000 will be, too, but 1700, 1800, and 1900 were not leap years.’
‘But 1600 and 2000 were leap years, because those year numbers are evenly divisible by 400.’
‘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.’
‘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.’
‘Therefore, the years 1700, 1800, 1900 and 2100 are not leap years, but 1600, 2000, and 2400 are leap years.’
‘If the year is not leap year nor festival year, then print the line ‘This is an ordinary year.’’
‘Our calendar year is either 365 days in non leap years or 366 days in leap years.’
‘I know leap years are roughly every four years, but I think there are some that aren't like that.’
‘There is really no reason for deviating from normal programming approaches for performing leap year calculations.’
‘It uses a globally accepted algorithm for determining which years are leap years.’
‘I could just divide the number of days by 365 if I did not have to account for those leap years.’
‘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.’
‘This means that 1700, 1800, and 1900 were not leap years, but 2000 was.’
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.