The time taken by Earth for one revolution is around 365.2425 days which means 365 days and an additional 1/4 day(0.2425). When Earth spins around its own axis this is termed as Earth’s Rotation and one rotation takes 24 hours which makes up for day and night.Įarth’s Revolution is when Earth moves around the Sun and one revolution makes up for one year. Rule 2: Years divisible by 4 are leap years except where specified by Rule 1.Ģ392 2396 2400 2404 2408 are leap years) From the perspective of mathematical logic: Rule 1: If the Year is divisible by 100 and the Year is not divisible by 400 then it is not a leap year.
For a century, the year needs to be divisible by 100 as well as 400 and only then it is considered as a Leap Year. In case a year is divisible by 100 but not by 4 then it is NOT considered as a LEAP YEAR. Leap year is divisible by 4:Ī general thumb rule applicable for any year to be a “leap year” is: it needs to be divisible by 4. Usually we believe that a leap year falls once every four years, in that case why would 2100, 22 will not be considered a leap year. The next leap year immediately following 2096 falls only after 8 years, on 2104, why is 2100 not a leap year?
When the United States purchased Alaska in 1867, Russians were still using the Julian calendar, and those in the territory of Alaska at the time lost 11 days. Though the pope’s calendar is used almost universally today, Russia didn’t accept the Gregorian calendar until 1918. Those folks living in the year 2100 will be denied a leap year thanks to the pope. The Gregorian calendar knocked out leap years in 18, but we’ll have one this year. He declared that if the year beginning a new century divided by 400 left no remainder, it would be a leap year. He made new leap year rules that apply to only the first years of each century. Pope Gregory XII decided he needed to fine tune Caesar’s calendar. He repaired the problem by getting rid of 10 days-October 4, 1582, was followed by October 15, 1582. In 1582, Pope Gregory XII noticed that the spring equinox occurred on March 11 instead of the date upon which it should have fallen, March 21. At the time, people ignored Bede’s finding because the difference between the Julian calendar and the sun’s trip around Earth added up to an error of only one day every 128 years.īut those years added up, and the calendar fell out of sync with the sun. The Julian calendar remained unchanged for more than seven centuries, until a monk known as the Venerable Bede calculated that the 365 1/4-day Julian year was 11 minutes, 14 seconds too long to keep perfect time with Earth’s journey around the sun. To honor his boss, Sosigenes named his creation the “Julian calendar.” He decided each calendar year should be 365 1/4 days, with one “leap day” added every four years. Sosigenes knew that it takes Earth 365 days, 5 hours, 48 minutes and 46 seconds to orbit the sun. Caesar noticed this error and enlisted Sosigenes, an astronomer from Alexandria, to invent a new calendar. As the years progressed, the lunar calendar became out of step with spring, summer, winter and fall.
#Was 2000 a leap year full#
The full moon marked the middle of the month, and as the moon waned back to new moon, the month was over. The ancient Babylonians began each new month on the day of the new moon. People figured out the day of the month by checking the phase of the moon, which orbits Earth every 29 days. In Caesar’s day, about 45 BC, most people followed the lunar calendar. Leap year stuck, but it wasn’t a smooth ride. The problem began more than 2,000 years ago, when Julius Caesar created “leap year,” slapping an extra day onto the end of February every four years.
The year 2000 exposes a basic flaw of the calendar-each year is about 11 minutes too long to keep the solstices and equinoxes where they should be.
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