Leap Year
In most calendar systems, the length of the year is given in multiples of 24-hour days. Unfortunately, the orbital period of the Earth is not an exact multiple of days: one tropical year = 365.24219 days.
leap year: years in which an extra day (February 29) is introduced so that the (Gregorian) calendar keeps step with the Earth's orbit.
Leap Year -- Every fourth year, in which a 366th day is added since the Earth's revolution takes 365 days 5 hr 49 min.
LECP -- Low-Energy Charged-Particular Detector onboard a spacecraft.
LEO -- Low Equatorial Orbit.
Leap year - A year in which there are 366 days
Light - The visible form of electromagnetic radiation
Light Curve - A plot of the brightness of a body versus time ...
Leap year
A leap year is a year containing one or more extra days in order to keep the calendar year synchronized with the astronomical year or seasonal year....
A leap year is 366 days = 8,784 hours = 527,040 minutes = 31,622,400 seconds.
(But some years may contain leap seconds.)
See also common year starting on Sunday and dominical letter.
A: Generally , leap years are divisible by four, but century years are special, they must also be divisible by 400. Since 2100 divided by 400 is not an integer, 2100 is not a leap year.
Be sure to keep leap years in mind (check out mase_e's writeup).
I like it! ...
leap year (NASA SP-7, 1965) See calendar year. leapfrog test (NASA SP-7, 1965) In computer operation, a check routine which eventually occupies every possible position in the memory.
*The instances of the equinoxes are not fixed but fall about six hours later every year, amounting to one full day in four years, but then they are reset by the occurrence of a leap year.
A further modification to the Gregorian Calendar has been suggested: years evenly divisible by 4000 are not leap years. This would reduce the error between the Gregorian Calendar Year and the true year to 1 day in 20,000 years.
On Mars, a similar intercalation scheme for leap years would be needed.
Caesar had added leap years to every year evenly divisible by 4. In recent times 1980, 1984, 1988, 1992, and 1996 are leap years. Now it is true that 2000 was a leap year, but not just because of Caesar's idea.
Over the centuries, astronomers have elaborated different methods to calculate the frequency of the leap years in the 128-year period.
Correcting at a stroke the 10-day accumulated margin of error of the Julian calendar, the main difference was in fact that century years were discounted as leap years unless they were divisible by 400. [A84] ...
If the first Full Moon of the calendar year happens on or before January 11 (or if it's a leap year, on or before January 12), you can bet that a Blue Moon is in store for that year.
The Persian year itself has 12 months--the first 6 have 31 days, the next 5 have 30 days, and the last has 28 or 29, depending on whether the year is or isn't a leap year. Each month corresponds to a sign of the zodiac.
3 days or about 18 years, 9 to 11 days, depending on the number of intervening leap years, and 8 hours.
2422 days, some years will have 365 days while some years, called leap years, will have 366 days. One extra day is added to the end of February every four years. By doing this, we are adding too much.
223 synodic months (6585.321 days) almost equal 242 draconic months (6585.357 days), a period of 18 years 10 and 1/3 (or 11 and 1/3) days -- depending on the number of intervening leap years.
answers vary (ask students to show their work) 876,000 hours 114 years 1,072,656 hours (or 1,073,376 hours if leap years are included in calculation) 350,400,000 hours 1771 1,322,760 hours 1,909,680 hours 2,803,200 hours 19,307, ...
The Gregorian calendar (instituted in 1582 by Pope Gregory XIII) corrected for the loss of one day every 128 years by dropping three leap years every 400 years. Century years were leap years only if evenly divisible by 400.
This may be handled, for example, by adding an extra day (29 February) in leap years. The same applies to months in a lunar calendar and also the number of months in a year in a lunisolar calendar. This is generally known as intercalation.
The calendar in current use, with normal years that are 365 days long, with leap years every fourth year except for years that are divisible by 100 but not by 400.
ground state - (n.) ...
The Egyptian year was divided into 36 ten day weeks, called Decans, plus five days at the end of the year to make 365, (for HS a discussion of leap year stuff) just as we have.
The sidereal year, measured relative to the stars, is longer than the tropical year by about 20 min. The calendar year is used for practical purposes and always contains a whole number of days, the ordinary year being 365 days and the leap year 366 ...
with respect to the stars as one year previously (sidereal year). This results in a slow change (one day per 71 calendar years) in the position of the sun with respect to the stars at an equinox. It is significant for calendars and their leap year ...
 See also: Year, Calendar, Time, Second, Period
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