Mesti buat cacatan hari ini sebab 29Febrari 2016 ini adalah Tahun Lompat..Leap Year ..kalausambut Hari Jadi ..alamat 4 tahun sekali baru jumpa..dapat sambut..so Happy birthday to u all speial people..
Leap Year 2016: Why does February have 29 days every four years?
When is it, why does it happen and everything else you need to know about the leap year in 20
February 29 crops up every four years, but what is a leap year?
Frogs are associated with leap years. This is a leaping frog Photo: Getty
Why do we have leap years?
A leap year, where an extra day is added to the end of February every four years, is down to the solar system's disparity with the Gregorian calendar.
A complete orbit of the earth around the sun takes exactly 365.2422
days to complete, but the Gregorian calendar uses 365 days.
So leap seconds - and leap years - are added as means of keeping our
clocks (and calendars) in sync with the Earth and its seasons.
Under his predecessor Julius Caesar, February had 30 days and the month named after him - July - had 31. August had only 29 days.
When Caesar Augustus became Emperor he added two days to 'his' month to make August the same as July.
So February lost out to August in the battle of the extra days.
There's a leap year every year that is divisible by four, except for years that are both divisible by 100 and not divisible by 400.
The added rule about centuries (versus just every four years) was an additional fix to make up for the fact that an extra day every four years is too much of a correction.
Pope Gregory XIII (1502-1585)
The Roman calendar did have 355 days with an extra 22-day month every two years, until Julius Caesar became emperor and ordered his astronomer Sosigenes to devise a better system in the 1st Century.
Sosigenes decided on a 365-day year with an extra day every four years to incorportate the extra hours, and so February 29th was born.
As an earth year is not exactly 365.25 days long Pope Gregory XIII's astronomers decided to lose three days every 400 years when they introduced the Gregorian calendar in 1582.
The maths has worked ever since but the system will need to be rethought in about 10,000 years' time.
Workers have realised that every leap year, they have to work one extra day for no extra pay.
If a person earns the national average salary of £26,500 a year, that works out at £2,208.33 per monthly payslip – which breaks down to £71.24 per day in a 31-day month but a daily wage of £78.87 in February.
This realisation prompted Karl Savage, who was a high school teacher from Maryland, to try and kick-start the “No Work on Leap Day Revolution” in 2008, when the extra day fell on a Friday.
Leap seconds are added to bring the earth's rotation into line with atomic time. A leap second was added at the end of June last year, when immediately before midnight dials read 11:59:60.
Atomic time is constant, but the Earth’s rotation is gradually slowing down by around two thousandths of a second per day.
Leap seconds are crucial to ensuring the time we use does not drift away from time based on the Earth's spin Photo: ALAMY
Leap seconds are therefore crucial to ensuring the time we use does not drift away from time based on the Earth's spin. If left unchecked, this would eventually result in clocks showing the middle of the day occurring at night.
The extra second can sometimes cause problems for some networks which rely on exact timings. When a last leap second was added in 2012 Mozilla, Reddit, Foursquare, Yelp, LinkedIn, and StumbleUpon all reported crashes and there were problems with the Linux operating system and programmes written in Java.
The Indian National Calendar and the Revised Bangla Calendar of Bangladesh arrange their leap years so that the leap day is always close to February 29 in the Gregorian calendar.
Some suggest those born before midday on February 29 should celebrate their birthdays on February 28, while those born in the afternoon and evening of the 28th should celebrate their special day on March 1 (St David's Day).
Those born around midday are less fortunate when it comes to picking a side.
About 4.1 million people around the world have been born on the 29th.
Pisces is the zodiac sign of a person born on February 29, and amethyst is the birthstone for this month.
Are you celebrating a birthday on February 29th? Majestic Wine is offering a free bottle of champagne (to those who buy six bottles).
(We gather the offer is open to those over 18 and not just 72-year-olds as you might imagine...)
Why does the extra day fall in February?
All the other months in the Julian calendar have 30 or 31 days, but February lost out to the ego of Roman Emperor Caesar Augustus.Under his predecessor Julius Caesar, February had 30 days and the month named after him - July - had 31. August had only 29 days.
When Caesar Augustus became Emperor he added two days to 'his' month to make August the same as July.
So February lost out to August in the battle of the extra days.
Technically, a leap year isn't every four years
The year 2000 was a leap year, but the years 1700, 1800 and 1900 were not.There's a leap year every year that is divisible by four, except for years that are both divisible by 100 and not divisible by 400.
The added rule about centuries (versus just every four years) was an additional fix to make up for the fact that an extra day every four years is too much of a correction.
Julius Caesar vs Pope Gregory
Pope Gregory XIII (1502-1585)The Roman calendar did have 355 days with an extra 22-day month every two years, until Julius Caesar became emperor and ordered his astronomer Sosigenes to devise a better system in the 1st Century.
Sosigenes decided on a 365-day year with an extra day every four years to incorportate the extra hours, and so February 29th was born.
As an earth year is not exactly 365.25 days long Pope Gregory XIII's astronomers decided to lose three days every 400 years when they introduced the Gregorian calendar in 1582.
The maths has worked ever since but the system will need to be rethought in about 10,000 years' time.
Is February 29 a bank holiday?
It's not - but there is a campaign to make February 29 a bank holiday.Workers have realised that every leap year, they have to work one extra day for no extra pay.
If a person earns the national average salary of £26,500 a year, that works out at £2,208.33 per monthly payslip – which breaks down to £71.24 per day in a 31-day month but a daily wage of £78.87 in February.
This realisation prompted Karl Savage, who was a high school teacher from Maryland, to try and kick-start the “No Work on Leap Day Revolution” in 2008, when the extra day fell on a Friday.
What is a leap second?
Leap years are not directly connected to leap seconds, but both are for the purpose of keeping the earth's rotations in line with our clocks and calendars.Leap seconds are added to bring the earth's rotation into line with atomic time. A leap second was added at the end of June last year, when immediately before midnight dials read 11:59:60.
Atomic time is constant, but the Earth’s rotation is gradually slowing down by around two thousandths of a second per day.
Leap seconds are crucial to ensuring the time we use does not drift away from time based on the Earth's spin Photo: ALAMYLeap seconds are therefore crucial to ensuring the time we use does not drift away from time based on the Earth's spin. If left unchecked, this would eventually result in clocks showing the middle of the day occurring at night.
The extra second can sometimes cause problems for some networks which rely on exact timings. When a last leap second was added in 2012 Mozilla, Reddit, Foursquare, Yelp, LinkedIn, and StumbleUpon all reported crashes and there were problems with the Linux operating system and programmes written in Java.
Other calendars require leap years
The modern Iranian calendar is a solar calendar with eight leap days inserted into a 33-year cycle.The Indian National Calendar and the Revised Bangla Calendar of Bangladesh arrange their leap years so that the leap day is always close to February 29 in the Gregorian calendar.
What if you're born on February 29?
The chances of having a leap birthday are one in 1,461. People who are born on February 29 are referred to as "leaplings", or "leapers". In non-leap years, many leaplings choose to celebrate their birthday on either February 28 or March 1, while purists stick to February 29 for the occasion.Some suggest those born before midday on February 29 should celebrate their birthdays on February 28, while those born in the afternoon and evening of the 28th should celebrate their special day on March 1 (St David's Day).
Those born around midday are less fortunate when it comes to picking a side.
About 4.1 million people around the world have been born on the 29th.
Pisces is the zodiac sign of a person born on February 29, and amethyst is the birthstone for this month.
Are you celebrating a birthday on February 29th? Majestic Wine is offering a free bottle of champagne (to those who buy six bottles).
(We gather the offer is open to those over 18 and not just 72-year-olds as you might imagine...)
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