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We have leap years in order to keep seasons, astronomical events, and time differences in sync.
Without leap years, the Gregorian calendar would lose veracity in just over a hundred years, leading to time differences between day and night.

Leap year

en.wikipedia.org/wiki/Leap_year

For example, in the Gregorian calendar, each leap year has 366 days instead of the .... One reason for this rule is that Yom Kippur, the holiest day in the Hebrew ...

Leap Year Nearly Every four years - Time and Date

www.timeanddate.com/date/leapyear.html

Feb 29, 2012 ... A leap year has 366 days, as opposed to a common year, which has 365. We add a leap day – February 29 – nearly every four years.

When is the next leap year? | Human World | EarthSky

earthsky.org/human-world/why-do-we-need-leap-years

No leap year in 2015. The next leap day will be February 29, 2016. The reason for leap years explained here.

Leap Year Explained - Infoplease

www.infoplease.com/spot/leapyear1.html

The Gregorian calendar, which now serves as the standard calendar for civil use throughout the world, has both common years and leap years. A common year ...

Why Is There a Leap Year? | WIRED

www.wired.com/2012/02/why-is-there-a-leap-year/

Feb 29, 2012 ... Really, the question should be: why aren't there even more leap years? Let me start with the basics. A Year. What is a year? To a child, this may ...

Leap Year - Geography For Kids - By KidsGeo.com

www.kidsgeo.com/geography-for-kids/0021B-understanding-time-leap-year.php

Leap Year. Written for the KidsKnowit Network by: Meredith Tennant. This year, 2012, is a leap year. What does that mean? Leap year happens every four years.

Leap Year -- from Eric Weisstein's World of Astronomy - ScienceWorld

scienceworld.wolfram.com/astronomy/LeapYear.html

A leap year is a year in which an extra day is added to the calendar in order to synchronize it with the seasons. Since the tropical year is 365.242190 days long,  ...

How could the year 2000 be a leap year when 1900 was not ...

science.howstuffworks.com/science-vs-myth/everyday-myths/question50.htm

The reason we care about our orbital position around the sun is because of the seasons. In the ... So 1700, 1800 and 1900 were not leap years, but 2000 was.

Leap Year: EnchantedLearning.com

www.enchantedlearning.com/time/leapyear/

Leap Year. Read about what a leap year is, why we have leap years, and how often we have a leap year.

Popular Q&A
Q: What is the reason of leap year.
A: it is something to do with how it takes 365 days to do a full orbit . sorry thats all I know. Read More »
Source: www.answers.com
Q: Reasons for leap years?
A: Roughly speaking it takes the Earth 365 and a quarter days to circle the sun, which is called a year. So every 4 years we need the extra day to stop the calenda... Read More »
Source: wiki.answers.com
Q: What is the reasoning behind leap year?
A: February has 29 days, we call it a leap year. Reason we care about our orbital position around the sun is because of the Read More »
Source: www.chacha.com
Q: What's the reasons of a leap year ?
A: The earth takes 365.25 days to orbit the sun. Our year has 365 days in, so each year, we lose a quarter of a day. Adding in an extra day every four years makes ... Read More »
Source: answers.yahoo.com
Q: How many smart people actaully know the real reason for leap year...
A: its a combination of the Earths rotation .. I e Astronmy and Solar years to keep it simple and Money more days mean higher profits .. thesame reason we have Day... Read More »
Source: answers.yahoo.com