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Please enter a valid password. Keep me logged in. Want an ad-free experience? Subscribe to Independent Premium. View offers. Every four years February has 29 days instead of This year is a leap year, according to the Gregorian calendar iStock.
Here's why: The Gregorian calendar, the most widely used across the globe, measures a year to be days following the Earth's orbit around the Sun. You can form your own view. Subscribe now. What can you do on a Leap Day? Enter your email address Continue Continue Please enter an email address Email address is invalid Fill out this field Email address is invalid Email already exists. I would like to receive morning headlines Monday - Friday plus breaking news alerts by email. Update newsletter preferences.
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How to know if it is a Leap Year:
Then there is a possibility or reason to make corrections in years dividable with Normal years will have day and those dividable with can get days. Or is this a loose-loose situation. You could just check if the Year number is divisible by both 4 and You dont really need to check if it is indivisible by The reason comes into question is because according to the Gregorian Calendar, our "day length" is slightly off, and thus to compensate that, we have regular years days each and 97 leap years days each.
The difference of those 3 extra years that are not leap years is to stay in cycle with the Gregorian calendar, which repeats every years. Look up Christian Zeller's congruence equation. It will help understanding the real reason. Hope this helps :. Simply Because year is a leap year and it is divisible by and dividable by 4. SO to guarantee it is correct leap we need to ensure it is divisible by I found this problem in the book "Illustrated Guide to Python 3". It was in a very early chapter that only discussed the math operations, no loops, no comparisons, no conditionals.
How can you tell if a given year is a leap year? Learn more.
No perfect calendar: why we have leap years and why the Earth's always out of sync
First 10 Free. Leap year calculation Ask Question. Asked 10 years, 6 months ago. Active 2 days ago.
The Surprising History Behind Leap Year
Viewed k times. In order to find leap years, why must the year be indivisible by and divisible by ? I understand why it must be divisible by 4. Please explain the algorithm. Dale Burrell 4, 5 5 gold badges 28 28 silver badges 57 57 bronze badges. For what it's worth, calendar calculations are surprisingly hard, especially if you have to get into leap seconds. If you're building a library, consider acquiring one instead. Good luck! It is not an algorithm, it is astronomical facts, adapted to human granularity I'm voting to close this question as off-topic because it has nothing to do with programming.
For what's worth, no one mentioned this, that if the year is divisible by , is NOT a leap year. Thus, , , , etc are not leap years. So we have to subtract, more or less, a quarter of a day to make it fit : Peter Peter You may want to mention that the small differences really do matter since the old Julian calendar did not have these corrections and by the 16th century the calendar was over 10 days off for astronomical events like solstices and more importantly the date of easter. For interest, the original source of the present leap-year calculation system is a document entitled "Inter gravissimas" issued by Pope Gregory XIII in Leap-seconds are for an unrelated issue: that a day is not exactly 24 hours long, and without them noon would after a long time be in the middle of the night.
Whereas leap-years correct the issue that the years isn't exactly days, and without correction december would be in summer in the N. There's an algorithm on wikipedia to determine leap years: function isLeapYear year : if year modulo 4 is 0 and year modulo is not 0 or year modulo is 0 then true else false There's a lot of information about this topic on the wikipedia page about leap years , inclusive information about different calendars. I just tested this and it correctly determines leap and non-leap years from the list of leap years at kalender Thanks so much for this algorithm.
It works perfectly! Rice Dec 9 '18 at Kevin I disagree. You seem to argue about details of the algorithm which in my opinion are not that important. At the very least it provides a lot of useful information about other calendars etc. I meant a terrible programming resource. The algorithm posted at Wikipedia is unvetted and subject to change and has been outright incorrect at times.